Dictionary

sillimanite

noun sil·li·man·ite \ˈsi-lə-mə-ˌnīt\

Definition of SILLIMANITE

:  a brown, grayish, or pale green mineral that consists of an aluminum silicate in orthorhombic crystals often occurring in fibrous or columnar forms
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Origin of SILLIMANITE

Benjamin Silliman †1864 American geologist
First Known Use: circa 1830

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