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sillimanite Syllabification: sil·li·man·ite
Pronunciation: /ˈsiləməˌnīt/

Definition of sillimanite in English:


An aluminosilicate mineral typically occurring as fibrous masses, commonly in schist or gneiss.
Example sentences
  • Muscovite and aluminosilicates are almost entirely absent although, where present, the aluminosilicate is sillimanite.
  • The aluminium silicate minerals andalusite, kyanite, and sillimanite are good examples of this phenomenon of polymorphism.
  • Growth of titanite took place during the metamorphic climax in rocks from the kyanite and sillimanite zones.


Mid 19th century: from the name of Benjamin Silliman (1779–1864), US chemist + -ite1.

Definition of sillimanite in:
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