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 and Etymology of sillimanite

Benjamin Silliman †1864 American geologist


First Known Use: circa 1830


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