Mineral - Sillimanite
Sillimanite
Chemical Properties
Mineral Class
Silicates
Toxicity
Formula
Al₂[O|SiO₄]
Unit Cell
Physical Properties
Hardness
6.5 - 7.5
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
brownyellowgreencolorless
Birefringence
Luster
Vitreous
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
Space Group
Habit
fibrous, prismatic
Formation
Metamorphose, Magmatisch
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Sillimanite