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About Sillimanite

Sillimanite is an aluminum silicate, related to both andalusite and kyanite. In fact these three minerals are polymorphs - they share the same chemical composition but different crystal structures.

Sillimanite is named after the American chemist Benjamin Silliman (1779-1864). Silliman was one of the first American professors of science and taught at Yale University.

Sillimanite gems may show a cat's eye and be cut en cabochon, or they may be faceted, transparent gemstones. The colors of sillimanite include colorless, grayish-white, green, bluish and brownish. A fibrous variety of sillimanite is traded as "fibrolite". Some sillimanite gemstones show pleochroism, which means that several colors may be exhibited in a single gemstone depending on the viewing angle.

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Buy Sillimanite Gems

Cushion Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Gray Sillimanite Cat's Eye

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval White Sillimanite Cat's Eye

1 pc (avg. 0.89 ct) Gray Sillimanite Cat's Eye

Oval Gray Sillimanite Cat's Eye

Oval Gray Sillimanite Cat's Eye

Oval Yellow Sillimanite

Oval White Sillimanite Cat's Eye

Oval Yellow Sillimanite

Oval Gray Sillimanite Cat's Eye

Oval Gray Sillimanite Cat's Eye

Oval White Sillimanite Cat's Eye

Oval Gray Sillimanite Cat's Eye

Oval White Sillimanite Cat's Eye

Oval Gray Sillimanite Cat's Eye

About Sillimanite

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