Rare gemstone, opaque with fiberlike inclusions (hence its alternate name fibrolite). The most sought-after type is blue sillimanite, which is only found in Myanmar; green and gray sillimanite is found in Sri Lanka. (All other sources do not produce gem-grade material.)

Sil"li*man*ite (?), n. [After Benjamin Siliman, an American mineralogist.] Min.

Same as Fibrolite.


© Webster 1913.

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