Buy Sillimanite Gems(34) |
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Faceted |
Cabochons |

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite

Oval Yellow Sillimanite
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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