Sillimanite
Aluminosilicate mineral and high-temperature metamorphic index mineral.
Robert M. Lavinsky · via Wikipedia: Sillimanite · CC BY-SA 3.0
Sillimanite, also known as fibrolite, is an aluminosilicate mineral with the formula Al2SiO5. It is one of three polymorphs, alongside andalusite and kyanite, and serves as an index mineral for high-temperature metamorphism. Named after chemist Benjamin Silliman, it was first described in 1824 from Chester, Connecticut.
Quick Facts
- Category
- Nesosilicate
- Formula
- Al; 2; SiO; 5
- IMA symbol
- Sil
- Strunz classification
- 9.AF.05
- Dana classification
- 52.02.02a.01
- System
- Orthorhombic
- Class
- Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)
- Symmetry
- Pbnm
Facts from the source article.
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