Mineral - Vermiculite
Vermiculite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Mg₀,7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄ · 8H₂O
Unit Cell
Physical Properties
Hardness
1.5 - 2
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
browngrayyellow
Birefringence
Luster
Greasy
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
leafy, massive
Formation
hydrothermal, Verwitterung (Z.B.von Biotit)
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Vermiculite