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sillimanite

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noun sil·li·man·ite \ˈsi-lə-mə-ˌnīt\

Definition of sillimanite

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



Origin of sillimanite

Benjamin Silliman †1864 American geologist


First Known Use: circa 1830


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