Mineral - Epistolite
Epistolite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Na₂(Nb,Ti)₂(Si₂O₇)O₂ · nH₂O
Unit Cell
Physical Properties
Hardness
2.5 - 3
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
whiteyellow
Birefringence
Luster
Silky,
Pearly
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
Space Group
Habit
leafy, coarse, massive, tabular
Formation
Magmatisch, Pegmatit
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Epistolite