Minerals

Minerals (A – Z)

(a slowly growing, but yet very incomplete and subjective selection)

You have the possibility to visualize the crystals structure of all these minerals in 3D not only with VESTA / Mercury but also online:

https://cds.dl.ac.uk/crystalworks/examples_minerals.html


Adamite

  • Named after the French mineralogist Gilbert-Joseph Adam (1795 – 1881)
  • Typically occuring in weathered zones above zink ores
  • Formula: Zn2(OH)(AsO4)
  • Space group: Pnnm (No. 58)
  • Crystal system: orthorhombic
  • Crystal class: mmm
  • Lattice parameters: a = 8.30 Å, b = 8.51 Å, c = 6.04, αβγ = 90°

adamite-139150

Picture: Rob Lavinsky, iRocks.com – CC BY-SA 3.0


Crystal structure (click on the picture to download the VESTA file):

adamite

AsO4 tetrahedra (green), ZnO6 octahedra (gray)


Anglesite

  • Named after the type locality (a locality, where a a particuliar mineral was first found/identified), which is here the Isle of Anglesey (Wales)
  • Occurs as an oxidation product of primary lead sulfide (PbS, Galena) ore
  • Formula: PbSO4
  • Space group: Pnma (No. 62)
  • Crystal system: orthorhombic
  • Crystal class: mmm
  • Lattice parameters: a = 8.48 Å, b = 5.40 Å, c = 6.96, αβγ = 90°

anglesite-anglesitetoussitminemorocco

Picture: Rob Lavinsky, iRocks.com – CC BY-SA 3.0


Crystal structure (click on the picture to download the VESTA file):

pbso4_anglesite

SO4 tetrahedra (yellow), PbO8 irregular polyhedra (gray)


Aragonite

  • named after the type locality Aragon (Spain)
  • one of the two naturally occuring forms of calcium carbonate (the other being calcite)
  • Formula: CaCO3
  • Space group: Pmcn (No. 62)
  • Crystal system: orthorhombic
  • Crystal class: mmm
  • Lattice parameters: a = 4.95 Å, b = 7.96 Å, c = 5.74, αβγ = 90°

aragonite-196792

Picture: Rob Lavinsky, iRocks.com – CC BY-SA 3.0


Crystal structure (click on the picture to download the VESTA file):

aragonite

CO3 triangles (black), CaO9 irregular polyhedra (blue)


Azurite

  • named after the color azure, a variation of blue that is often
    described as the color of the sky
  • one of the two basic copper(II) carbonate minerals, the other being malachite
  • Formula: Cu3(CO3)2(OH)2
  • Space group: P21/c (No. 14)
  • Crystal system: monoclinic
  • Crystal class: 2/m
  • Lattice parameters: a = 5.01 Å, b = 5.58 Å, c = 10.35 Å, α = 90°, β = 92.4°, γ = 90°

azurite-155874

Picture: Rob Lavinsky, iRocks.com – CC BY-SA 3.0


Crystal structure (click on the picture to download the VESTA file):

azurite

CO3 triangles (black), CuO5 tetragonal pyramids (yellow)

 


 

Baryte

  • named after the greek word for heavy (the density is relatively high
    with 4.5 g/cm3)
  • Formula: BaSO4
  • Space group: Pnma (No. 62)
  • Crystal system: orthorhombic
  • Crystal class: mmm
  • Lattice parameters: a = 8.88 Å, b = 5.46 Å, c = 7.16 Å, α = β = γ =  90°

6158m-barite2

Picture: Carlesmillan – CC BY-SA 3.0


Crystal structure (click on the picture to download the VESTA file):

baryte

slightly distorted SO42- tetrahedra (yellow), Ba2+ ions (green), which are surrounded by 12 oxygen atoms


 

Bayldonite

  • named after its discoverer, the British physicist John Balydon
  • Formula: PbCu3(AsO4)2(OH)2
  • Space group: C2/c (No. 15)
  • Crystal system: monoclinic
  • Crystal class: 2/m
  • Lattice parameters: a = 10.15 Å, b = 5.89 Å, c = 14.08 Å, β  106.1°

bayldonite-173845

Picture: Rob Lavinsky, iRocks.com – CC BY-SA 3.0


Crystal structure (click on the picture to download the VESTA file):

bayldonite

  • Cu: blue, As: green, Pb: black, O: red, H: white
  • elongated CuO6 octahedra
  • AsO4 tetrahedra
  • Pb surrounded by 7 oxygen atoms

 


Benitoite

  • named after its type locality San Benito County (California)
  • it is the official state gem of California
  • Formula: BaTiSi3O9
  • Space group: P-6c2 (No. 188)
  • Crystal system: hexagonal
  • Crystal class: -6m2
  • Lattice parameters: a = b =  6.641 Å, c = 9.7579 Å, α = β = 90°, γ  120°

benitoite_hd

Picture: Didier Descouens – CC BY-SA 4.0


Crystal structure (click on the picture to download the VESTA file):

benitoite

  • Ba: green, Ti: lightblue, Si: orange, O: red
  • TiO6 octahedra, SiO4 tetrahedra
  • three corner-connected SiO4 tetrahedra build a ring

 


Beryl

  • named after the latin word beryllus or greek word beryllos, respectively, which is referred to “precious blue-green color-of-sea water stone”
  • the first lenses were made of beryl, as glass could not be made clear enough; this is the origin of the German word for glasses, i.e. “Brille”
  • there are important varieties, namely the blue Aquamarine (Fe2+ impurities), the Green Emerald (Cr3+ impurities), the Golden Beryl (Fe3+ impurities), the Pink or Rose Beryl named Morganite (after the financier J.P. Morgan, containing Mn2+ impurities), and the Red beryl
  • Formula: Al2Be3Si6O18
  • Space group: P6/mmc (No. 192)
  • Crystal system: hexagonal
  • Crystal class: 6/mmm
  • Lattice parameters: a = b =  9.219 Å, c = 9.198 Å, α = β = 90°, γ  120°

 


beryl-aquamarin_118278

Picture: Aquamarine, Rob Lavinsky, iRocks.com – CC BY-SA 3.0


beryl-quartz-emerald-zambia-33mm_0885

Picture: Aquamarine, Rob Lavinsky, iRocks.com – CC BY-SA 3.0


beryl-gold_beryl_tt64a

Picture: Golden Beryl, Rob Lavinsky, iRocks.com – CC BY-SA 3.0


beryl-albite_morganit-197426

Picture: Morganit, Rob Lavinsky, iRocks.com – CC BY-SA 3.0


beryl-red-beryl-196800

Picture: Red Beryl, Rob Lavinsky, iRocks.com – CC BY-SA 3.0


Crystal structure (click on the picture to download the VESTA file):

beryl

 

  • yellow: SiO4 tetrahedra, six tetrahedra are corner-connected to form a ring
  • green: distorted BeO4 tetrahedra
  • blue: slightly distorted AlO6 octahedra

Bornite

  • named after the Austrian mineralogist Ignaz von Born
  • also known as peacock ore because in air this mineral forms very quickly an iridescent coverage on its surface
  • Formula: Cu5FeS4
  • Space group: Pbca (No. 61)
  • Crystal system: orthorhombic
  • Crystal class: mmm
  • Lattice parameters: a = 10.950 Å, b = 21.862 Å, c = 10.950, αβγ = 90°

bornite_irocks

Picture: Rob Lavinsky, iRocks.com – CC BY-SA 3.0


Crystal structure (click on the picture to download the VESTA file):

bornite

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • yellow: Sulfur, blue: Copper, orange: Iron
  • The structure is based on a cubic-closest packing of sulfide ions; the copper and iron ions are located in 3/4 of the tetrahedral voids of the packing. At temperatures above 228 °C the cations are completely randomly distributed over these sites, forming a genuine cubic phase, but in the low temperature modification the cations are more ordered, which is accompanied with a symmetry reduction to the orthorhombic crystal system

 


Celestine

  • named from the Latin word caelestis meaning celestial, which in turn is derived from the Latin word caelum meaning sky or heaven because of its often soft blue color
  • pure Celestine is colourless
  • due to lattice defects in Celestine, colour centres are created which give the crystal its characteristic bluish colour
  • these centers are often additionally stabilized by the presence of pottasium ions
  • heating to over 200 °C “cures” these lattice defects and the mineral loses its color
  • radiation with X-rays creates new or more lattice defects and the color returns or can be intensified.
  • Formula: SrSO4
  • Space group: Pnma (No. 62)
  • Crystal system: orthorhombic
  • Crystal class: mmm
  • Lattice parameters:  a = 8.360 Å, b = 5.352 Å, c = 6.858 Å, αβγ = 90°

Picture: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0


Crystal structure (click on the pictures to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • SO4 tetrahedra (yellow)
  • SrO8 polyhedra (green)
  • Oxygen (red)

For a 3D interactive version, see here:

https://skfb.ly/6zG6R

 


Cinnabar

  • probably named after the Persian word for dragon blood because of its characteristic red colour
  • used since ancient times as a pigment
  • Formula: HgS
  • Space group: P3121 (No. 152) or P3221 (No. 154)
  • Crystal system: trigonal
  • Crystal class: 32
  • Lattice parameters: a = b = 4.1347(6) Å, c = 9.4451(3) Å, αβ = 90°, γ = 120°

Modified by CombineZP

Modified by CombineZP

Picture: JJ Harrison (jjharrison89@facebook.com) – CC BY-SA 3.0

 


Crystal structure (click on the pictures to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

cinnabar_01

View along the c axis.

cinnabar_02

View along the a axis.

  • the crystals structure is characteristic of chains with alternating sulfur and mercury atoms, which form helices with the helix axis running parallel to the c axis.
  • These helices are also the reason why crystals of cinnarbar are optically active (see: A.M. Glazer, K. Stadnicka, “On the origin of optical activity in crystal structures”. J. Appl. Cryst. 19 (2), 1986, 108–122. doi:10.1107/S0021889886089823

 


 

Crocoite

  • The name crocoite comes from the Greek “krokos” = saffron, alluding to the saffron-orange color of its powder
  • Formula: PbCrO4
  • Space group: P21/n (No. 14)
  • Crystal system: monoclinic
  • Crystal class: 2/m
  • Lattice parameters: a = 7.127 Å, b = 7.438 Å, c = 6.799 Å, α = 90°, β = 102.43°, γ = 90°

crocoite-360746_pd

Picture: Juergen Merzhttp://www.mindat.org/photo-360746.html
(This image has been released to the public domain.)


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

crocoite

View along the a axis.

Gray: Pb, red: O, orange: CrO4 tetrahedra

 


 

Dioptase

  • The name dioptase comes from the Greek words “dia” (= through) and “optos” (= visible), alluding to the visible cleavage planes inside the often highly transparent or translucent crystals
  • Formula: CuSiO3 · H2O
  • Space group: R-3 (No. 148)
  • Crystal system: trigonal
  • Crystal class: -3
  • Lattice parameters: a = b = 14.566 Å, c = 7.778 Å, αβ = 90°, γ = 120°

Dioptase Tsumeb

Dioptase Tsumeb

Picture: Didier Descouens – CC BY-SA 3.0


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

dioptase

View along the c axis.

  • six SiO4 tetrahedra (orange) are corner-connected to build a ring, so the mineral belongs to the cyclo silicates
  • the copper atoms (blue) are octahedrally coordinated by six oxygen atoms (red), four of them are oxygens involved in SiO4 tetrahedra and they occupy the equatorial positions of the CuO6 octahedra and two of them are oxygen atoms of water molecules, which occupy the axial positions of the CuO6 octahedra
  • the CuO6 octahedra are edge-connected and build a continuous 3D net

 


β-Eucryptite

  • Named from the Greek for “well” and “concealed”, in reference to its occurrence as intimate intergrowths with the mineral albite
  • It is the main component of the fameous glass-ceramic cooktops for stoves, known in the EU under the trademark Ceran® from Schott AG
  • Formula: LiAlSiO4
  • Space group: P6222 (No. 180)
  • Crystal system: hexagonal
  • Crystal class: 622
  • Lattice parameters: a = b = 10.500 Å, c = 11.194 Å, αβ = 90°, γ = 120°

Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • SiO4 tetrahedra (orange)
  • AlOtetrahedra (light blue)
  • Li (purple/pink)
  • Oxygen (red)

For a 3D interactive version, see here:

https://skfb.ly/6wqY9


Freieslebenite

  • Named after the mine commissioner of Saxony (Germany) Johann Carl Freiesleben
  • Formula: AgPbSbS3
  • Space group: P21/a (No. 14)
  • Crystal system: monoclinic
  • Crystal class: 2/m
  • Lattice parameters: a = 7.518 Å, b = 12.809 Å, c = 5.940 Å, α = 90°, β = 92.25°, γ = 90°

freieslebenite-169965

Picture: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

freieslebenite

View along the c axis.

  • AgS3 (ditorted) trigonal-planar coordination environment (gray)
  • SbS3 trigonal-pyramidal coordination environment (green)
  • PbS6 distorted octahedra (orange)

 


Gottlobite

  • Literally translated from German the meaning is “Thank God” or also “Praise God”; it is named after its type locality, the hill Gottlob (573 m) near Friedrichroda, Thuringia, Germany
  • Known only since 1996
  • Formula: CaMg(VO4,AsO4)(OH)
  • Space group: P212121 (No. 19)
  • Crystal system: orthorhombic
  • Crystal class: 222
  • Lattice parameters: a = 7.501 Å, b = 9.010 Å, c = 5.941 Å, α = β =  γ = 90°

gottlobite

Picture: CC BY-SA 3.0 de – Thomas Witzkehttp://tw.strahlen.org/typloc/gottlobit.html


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

gottlobite

View along the c axis.

  • MgO6 octahedra (orange)
  • AsO4/VO4 tetrahedra (purple)
  • Ca (blue)
  • Oxygen (red)

For a 3D interactive version, see here:

https://skfb.ly/6nBSF

 


Hercynite

  • Named after the latin name Silva Hercynia of the Bohemian Forest, where this mineral was first found
  • it is a ferro spinel
  • Formula: FeAl2O4
  • Space group: Fd-3m (No. 227)
  • Crystal system: cubic
  • Crystal class: m-3m
  • Lattice parameters: a = b = c = 8.1458 Å, α = β =  γ = 90°

Picture: CC BY-SA 3.0 nl | Fred Kruijen | http://www.mindat.org/photo-73060.html


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • FeO4 tetrahedra (orange)
  • Al (blue), octahedral oxide coordination environment
  • Oxygen (red)

For a 3D interactive version, see here:

https://skfb.ly/66QEE

 


Ilmenite

  • Named after its type locality, the Ilmensky Mountais in the Southern Urals (Russia)
  • Most important titanium mineral; it is predominantly mined for titanium dioxide production
  • Formula: FeTiO3
  • Space group: R-3 (No. 148)
  • Crystal system: trigonal
  • Crystal class: -3
  • Lattice parameters: a = b = 5.0884 Å, c = 14.0855 Å, αβ = 90°, γ = 120°

Picture by Modris Baum (Public Domain)


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • FeO6 distorted octahedra (brown)
  • TiO6 distorted octahedra (blue)
  • Oxygen (red)
  • The structure can be derived from the corundum (Al2O3) type: in corundum all cations are identical but in ilmenite Fe2+ and Ti4+ ions occupy alternating layers perpendicular to the c axis
  • Within the alternating layers the FeO6 / TiO6 octahedra are edge-connected to give six-membered rings (the centre of the hexagons are unoccupied)

For a 3D interactive version, see here:

https://skfb.ly/6ps9E

 


Jarosite

  • Named after its type locality, Barranco del Jaroso in the Sierra Almagrera (near Los Lobos, Cuevas del Almanzora, Almería, Spain)
  • In 2004 the Mars Exploration Rover – B found Jarosite on Mars. Because on Earth Jarosite is only formed in liquid water, this finding strongly indicates that Mars once possessed large amounts of liquid water.
  • Formula: KFe3(OH)6(SO4)2
  • Space group: R-3m (No. 166)
  • Crystal system: trigonal
  • Crystal class: -3m
  • Lattice parameters: a = b = 7.304 Å, c = 17.268 Å, αβ = 90°, γ = 120°

Picture: CC BY-SA 3.0 | Christian Rewitzer


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • KO12 only very slightly distorted icosahedra (purple)
  • FeO6 octahedra (blue)
  • SO4 tetrahedra (yellow)
  • Oxygen (red)

For a 3D interactive version, see here:

https://skfb.ly/6pGuY

 


Keyite

  • Named after the mineral dealer Charley Key, who discovered some tiny blue crystals of this mineral on a sample of green Adamite
  • Formula: Cu3(Zn,Cd)4Cd2(AsO4)6· 2 H2O
  • Space group: I2/a (No. 15)
  • Crystal system: monoclinic
  • Crystal class: 2/m
  • Lattice parameters: a = 11.654 Å, b = 12.780 Å, c = 6.268 Å, αγ = 90°, β = 99.11°

Picture: CC BY-SA 3.0 | Christian Rewitzer


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • CuO4 square-planar units (blue)
  • CuO6 distorted octahedra (blue)
  • CdO6 distorted trigonal prismatic units (pink)
  • AsO4 distorted tetrahedra (green)
  • Oxygen (red)
  • Oxygen of water molecules (black)

For a 3D interactive version, see here:

https://skfb.ly/67tQD

 


Lavendulan

  • The colour varies between turquoise and lavender, often also electric blue specimens can be found (see the picture below)
  • Formula: NaCaCu5(AsO4)4Cl · 5 H2O
  • Space group: P21/n (No. 14)
  • Crystal system: monoclinic
  • Crystal class: 2/m
  • Lattice parameters: a =  10.011, b = 19.478 Å, c = 10.056 Å, α = 90° β = 90.37°, γ = 90°

Picture: CC BY-SA 3.0 | Christian Rewitzer


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • CuO5 tetragonal pyramids (blue)
  • CaO6 distorted octahedra (light blue)
  • NaO6 distorted trigonal prismatic units (yellow)
  • AsO4 tetrahedra (green)
  • Oxygen (red)
  • Oxygen of water molecules (dark red)

For a 3D interactive version, see here:

https://skfb.ly/6qsoV

 


Mellite

  • Also known as honeystone due to its often honey-yellow color
  • Mellite is the aluminium salt of mellitic acid, i.e. benzene hexacarboxylic acid
  • Formula: Al2C6(COO)6 · 16 H2O
  • Space group: I41/acd (No. 142)
  • Crystal system: tetragonal
  • Crystal class: 4/mmm
  • Lattice parameters: a = b = 15.553 Å, c = 23.110 Å, α = β = γ = 90°

Picture: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,” J. Appl. Crystallogr., 44, 1272-1276 (2011).)

 

 

  • AlO6 octahedra (blue)
  • Oxygen (red)
  • Carbon (black)
  • Hydrogen (white)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/6rSSR

 


Nadorite

  • Named after its type locality Djebel Nador, Constantine, Algeria
  • Formula: PbSbO2Cl
  • Space group: Cmcm (No. 63)
  • Crystal system: orthorhombic
  • Crystal class: mmm
  • Lattice parameters: a = 5.603 Å, b = 12.245 Å, c = 5.448 Å, α = β = γ = 90°

 

Picture: Christian Rewitzer – CC-BY-SA-3.0

 


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

 

 

  • PbO4Cl4 square antiprisms (gray)
  • SbO4 square pyramids (purple)
  • Oxygen (red)
  • Chlorine (green)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/6sErr

 


Osarizawaite

  • Named after its type locality Osarizawa mine, Akita Prefecture, Japan
  • Formula: PbCuAl2(SO4)2(OH)6
  • Space group: R-3(No. 166)
  • Crystal system: trigonal
  • Crystal class: -3m
  • Lattice parameters: a = 7.075 Å, b = 7.075 Å, c = 17.248 Å, α = β  = 90°, γ = 120°


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

 

 

  • PbO12 (slightly distorted) icosahedra (gray)
  • SO4 tetrahedra (yellow)
  • Cu/AlO6 octahedra (blue)
  • Oxygen (red)
  • Hydrogen (white)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/6tUsu

 


Pascoite

  • Named after its type locality Pasco Province, Peru
  • Formula: Ca3V10O28 · 17 H2O
  • Space group: C2/(No. 12)
  • Crystal system: monoclinic
  • Crystal class: 2/m
  • Lattice parameters: a = 19.586 Å, b = 10.141 Å, c = 10.911 Å, α = γ  = 90°, β = 120.815°

Picture: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

 

  • Clusters of Decavanadate anions [V10O28]6- (orange)
  • CaO7 polyhedra (blue)
  • Oxygen (red)
  • Hydrogen (white)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/696Kr

 


Rodalquilarite

  • Named after its type locality, the Rodalquilar gold deposit, Almeria, Spain
  • Formula: Fe2(TeO2OH)3(TeO3)Cl
  • Space group: P-1 (No. 2)
  • Crystal system: triclinic
  • Crystal class: -1
  • Lattice parameters: a = 5.103 Å, b = 6.653 Å, c = 9.012 Å, α = 73.40, β = 78.03° γ  = 76.76°

Picture: Christian Rewitzer  | CC BY-SA-3.0


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

 

  • FeO6 octahedra (brown)
  • TeO3 trigonal pyramids (blue)
  • Oxygen (red)
  • Hydrogen (white)
  • Chlorine (green)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/69DIu

 


Samsonite

  • Named after its type locality, the Samson Vein of Andreasberg silver mines, Harz Mountains, Germany.
  • Formula: Ag4MnSb2S6
  • Space group: P21/(No. 14)
  • Crystal system: monoclinic
  • Crystal class: 2/m
  • Lattice parameters: a = 10.3861 Å, b = 8.1108 Å, c = 6.6630 Å, α = γ = 90°, β = 92.639°

 


Picture: Christian Rewitzer  | CC BY-SA-3.0


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • MnO6 octahedra (purple)
  • SbS3 trigonal pyramids (blue)
  • AgSdistorted tetrahedra (gray)
  • AgStrigonal-planar coordination (green)
  • Sulfur (yellow)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/69Hqz

 


Spessartine

  • Named after its type locality Spessart (Bavaria, Germany)
  • Formula: Mn3Al2[SiO4]3
  • Space group: Ia-3(No. 230)
  • Crystal system: cubic
  • Crystal class: m-3m
  • Lattice parameters: a = = c = 11.621 Å, αβ = γ = 90°

Picture: Rob Lavinsky – iRocks.com  | CC BY-SA-3.0


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • MnO8 polyhedra (purple)
  • AlO6 octahedra (blue)
  • SiOtetrahedra (orange)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/6BQQP


Strengite

  • Named after Johann August Streng (1830-1897), German mineralogist, University of Giessen, Germany
  • Formula: FePO4 · 2 H2O
  • Space group: Pbca (No. 61)
  • Crystal system: orthorhombic
  • Crystal class: mmm
  • Lattice parameters: a = 8.722 Å, = 9.878 Å, c = 10.8117 Å, αβ = γ = 90°

Picture: Christian Rewitzer  | CC BY-SA-3.0


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • FeO6 octahedra (dark-red)
  • POtetrahedra (green-blue)
  • Oxygen (red)
  • Hydrogen (white)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/6BVJs

 


 

Thaumasite

  • first described in 1878 in Sweden and named from the Greek, “thaumazein”, to be surprised, in reference to its unusual composition with carbonate, sulfate and hydroxysilicate anions
  • Formula: Ca3Si(OH)6(CO3)(SO4)
  • Space group: P63 (No. 173)
  • Crystal system: hexagonal
  • Crystal class: 6
  • Lattice parameters: ab = 11.0538 Å, c = 10.4111 Å, α = β = 90°, γ = 120°

Picture: Rob Lavinsky| iRocks.com  | CC BY-SA-3.0


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • CaO8 polyhedra (blue)
  • SiO6 octahedra (orange)
  • SOtetrahedra (yellow)
  • COtrigonalplanar coordination (gray)
  • Oxygen (red)
  • Hydrogen (white)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/6urWZ

 


Valentinite

  • named in honour of Basilius Valentinus, a writer on alchemy. He is the supposed author of the first book to give a detailed description of antimony and its compounds.
  • Formula: Sb2O3
  • Space group: Pccn (No. 56)
  • Crystal system: orthorhombic
  • Crystal class: mmm
  • Lattice parameters: a = 4.89960 Å, b = 12.4490 Å, c = 5.41030 Å, α = β = γ = 90°

Picture: Christian Rewitzer | CC BY-SA-3.0


Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

  • corner-connected SbO3 pyramids (purple)
  • Oxygen (red)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/6utNI

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