Spangolite – A Pyroelectric Copper Sulfate Sheet Mineral

Spangolite

  • Named in honour of Norman Spang (1841–1922), a mineral collector from Pennsylvania, USA; for details, see here.
  • Spangolite is pyroelectric
  • Formula: Cu6Al(SO4)(OH)12Cl · 3 H2O
  • Space group: P31(No. 159)
  • Crystal system: trigonal
  • Crystal class: 3m
  • Lattice parameters: a = b = 8.254(4) Å, c = 14.354(8) Å, α = β = 90°, γ = 120°

Picture: Christian Rewitzer, CC BY-SA 3.0
https://commons.wikimedia.org/w/index.php?curid=14865917


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).)

  • CuO6 distorted octahedra (blue)
  • AlO6 octahedra (orange)
  • SOtetrahedra (yellow)
  • Oxygen (red)
  • Chlorine (green)
  • Hydrogen (white)

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

https://skfb.ly/6Q6U7

References:

[1] Spangolite
H. A. Miers
Mineralogical Magazine 1894, 10, 273-277

DOI: 10.1180/minmag.1894.010.48.02

[2] The Crystal Structure of Spangolite, a Complex Copper Sulfate Sheet Mineral
F.C. Hawthorne, M. Kimata, R.K. Eby
American Mineralogist 1993, 78 (5-6), 649-652.

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