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Sillimanite


Sillimanite : Al2[O|SiO4]

Photo Copyright © Joshua Baimel (8/2006)  - This image is copyrighted. Unauthorized reproduction prohibited.
Pale periwinkle double-terminated gemmy crystal showing great pleochroism down the c-axis, as the crystal turns to a pale yellow when shifted. The crystal weighs 7.9 carats and exhibits great form and transparency for a species that is not often gemmy. Overall dimensions are 17.5 mm x 8.6 mm x 4.2 mm.

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