Mineral - Halloysite
Halloysite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Al₂(Si₂O₅)(OH)₄
Unit Cell
Physical Properties
Hardness
1 - 2
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
whiteyellowblue
Birefringence
Luster
Earthy,
Waxy
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
coarse, massive
Formation
Metasomatism (from feldspar)
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Halloysite