Sillimanite is usually fibrous in wavy bundles, it is sometimes also known as fibrolite. Rarely in well defined rectangular to square cross-sectioned prisms.
Sillimanite is named after Benjamin Silliman, Professor of Chemistry and Geology, Yale University, New Haven, Connecticut, USA.
Sillimanite is found in Colorless or white to gray, yellow-green, gray-green, blue-green, Sapphire blue, yellowish, brownish, greenish, violet-blue colours.
Significant Gem Localities:-
Mined in India, Burma, Sri Lanka, Kenya, USA, Canada, Ireland, Scotland, France, Germany, Czechoslovakia, Brazil, Madagascar, Korea, South Africa, Tanzania.
Mohs scale hardness 6 – 7.5
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