Sillimanite
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Physical & Optical Properties
Mohs Hardness
Crystal System
Value & Market
Where to Buy Sillimanite
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About Sillimanite
Sillimanite is a fibrous to prismatic aluminum silicate polymorph found in high-grade metamorphic rocks, displaying colors from white and colorless to pale blue, green, or gray with a vitreous to silky luster. Transparent gemstone-quality sillimanite is rare and prized, with fine blue and pale green faceted stones from Myanmar and Sri Lanka treasured by collectors. It is the state mineral of Delaware and part of the andalusite-kyanite-sillimanite polymorphic trio representing different pressures and temperatures of metamorphism.