Tremolite Crystallography

Composition

Ca2(Mg,Fe2+)5Si8O22(OH)2

Classification

Double-Chain Inosilicate

Structural parameters

a=9.86, b=18.118, c=5.285Å
alpha=90, beta=104.57, gamma=90°
Space Group: C2/m

atom

x/a

y/b

z/c
Si1 0.2798 0.0839 0.2955
Si2 0.2882 0.1707 0.8032
Mg1 0 0.0877 1/2
Mg2 0 0.1770 0
Mg3 0 0 0
Ca4 0 0.2776 1/2
O1 0.1117 0.0862 0.2171
O2 0.1190 0.1712 0.7235
OH3 0.1104 0 0.7157
O4 0.3658 0.2470 0 .7951
O5 0.3451 0.1326 0 .0950
O6 0.3429 0.1192 0.5844
O7 0.3354 0 0.2946

Reference

Sueno, S., M. Cameron, J.J. Papike and C.T. Prewitt. 1973. The high temperature crystal chemistry of tremolite T=400 C. American Mineralogist. 58:649-664.

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Original release: 1 Oct 1998;