sillimanite
noun
sil·li·man·ite
ˈsi-lə-mə-ˌnīt 
: 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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“Sillimanite.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sillimanite. Accessed 17 Dec. 2024.
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