aenigmatite Crystallography

Classification

Unclassified Silicate

Structural Parameters

a=10.406, b=10.813, c=8.926 Å
alpha=104.93, beta=96.87, gamma=125.32°
Space Group: P -1

atom

x/a

y/b

z/c
Fe/Ti 0.0000 0.0000 0.5000
Fe/Ti 0.0000 0.5000 0.0000
Fe/Ti 0.3214 0.8528 0.1779
Fe/Ti 0.7655 0.8199 0.1511
Fe/Ti 0.0961 0.9392 0.0530
Fe 0.5959 0.9432 0.0661
Ti/Fe 0.9970 0.7434 0.2577
Na 0.2089 0.6298 0.3893
Na 0.6607 0.6117 0.3741
Si 0.4768 0.2345 0.3313
Si 0.9864 0.2363 0.3466
Si/Fe 0.7921 0.3435 0.2416
Si/Fe 0.2772 0.3382 0.2252
Si/Fe 0.6487 0.9448 0.4447
Si/Fe 0.3528 0.5588 0.0501

Reference

Cannillo, E., F. Mazzi, J.H. Fang, P.D. Robinson, and Y. Ohya. 1971. The crystal structure of aenigmatite sample FRO. American Mineralogist 56:427-446


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Original release: 1 Oct 1998;