#30

Pnc2

Example – Terskite, Na₄Zr[H₄Si₆O₁₈]

Named for the southeastern shore of the Kola Peninsula, known since the time of the first Russian settlement as the Tersk coast.

Crystal structure of terskite Na₄Zr[H₄Si₆O₁₈]

Pudovkina Z V, Chernitsova N M
Doklady Akademii Nauk SSSR 316 (1991) 645-649

http://www.mindat.org/min-3915.html

CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=14451.cif&down=cif

ZrO6 octahedra
SiO4 tetrahedra

3D rotatable model of Terskite

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