Schoenfliesite

• Named in 1971 by George T. Faust and Waldemar T. Schaller in honor of Arthur Moritz Schoenflies ( 17 April 1853 – 27 May 1928) Professor of Mathematics, University of Frankfurt. Schoenflies’ researches in group theory and topology resulted in his proof of the 230 space groups.
• Formula: MgSn(OH)₆ 
• Space group: Pn-3 (No. 201)
• Crystal system: cubic
• Crystal class: m-3
• Lattice parameters: a = b = c = 7.7449(4) Å, α = β = γ = 90°

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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).)

• MgO₆ octahedra (orange)
• SnO₆ octahedra (blue-gray)
• Hydrogen (white)

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

https://skfb.ly/6QpyS

Reference:

Description of Schoenfliesite, MgSn(OH)₆, and Roxbyite, Cu_1.72S, from a 1375 BC Shipwreck, and Rietveld Neutron-diffraction Refinement of Synthetic Schoenfliesite, Wickmanite, MnSn(OH)₆, and Burtite, CaSn(OH)₆
L.C. Basciano, R.C. Peterson, P.L. Roeder
The Canadian Mineralogist 1998, 36, 1203-1210.

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