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Home > Sillimanite


Sillimanite is an alumino-sillicate mineral with the chemical formula Al2SiO5. Sillimanite is named after the American chemist B. Silliman ( 1779- 1824).

1 Occurrence

Sillimanite is one of three alumino-sillicate polymorphs, the other two being andalusite and kyanite. A common variety of sillimanite is known as fibrolite, so named because the mineral appears like a bunch of fibres twisted together when viewed under thin section or even by the naked eye. Both the fibrous and traditional forms of sillimanite are common in metamorphosed sedimentary rocks.


2 Details

Crystallographic systemOrthorhombic
ColoursWhite, brown and green
LustreSilky if in fibrous form, else vitreous
Hardness7.5
Refractive index 1.641-1.648
Cleavage1
Twinningn/a
PleochroismColourless to pale brown to yellow
Type locality Vltava, Susice , Czech Republic.

3 Related minerals

4 External links

Minerals Silicate mineralsThe silicate minerals make up the the largest and most important class of rock-forming minerals. They are classified based on the structure of their silicate anion group. Subclasses: Nesosilicates Nesosilicates (or orthosilicates have SiO tetrahedra that

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Sillimanite Minerals Andalusite Named Common Fibrous

Topics: Sillimanite Minerals Andalusite Named Common Fibrous Kyanite...

SillimaniteSillimanite is an alumino-sillicate mineral with the chemical formula AlSiO. Sillimanite is named after the American chemist B. Silliman ( 1779- 1824). Occurrence Sillimanite is one of three alumino-sillicate polymorphs, the other two being andalusite and  


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