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:
The Fascination of Crystals and Symmetry 