Tag Archives: crystals

Rodalquilarite

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

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Pascoite – a mineral with decavanadate anions

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

Keyite – A Complex Copper-Zinc-Cadmium Arsenate

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

Hercynite – A ferro spinel

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

Gottlobite: The “Thank God” Mineral

Gottlobite

  • Literally translated from German the meaning is “Thank 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

Freieslebenite

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)

The official gem of California: Benitoite

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