Mineral - Vishnevite
Vishnevite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(Na,K)₈(Al₆Si₆O₂₄)(SO₄,CO₃) · 2H₂O
Unit Cell
Physical Properties
Hardness
5 - 6
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
graybluecolorless
Birefringence
Luster
Vitreous,
Pearly
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
hexagonal
Point Group
Space Group
Habit
coarse, massive
Formation
Magmatisch, Pegmatit
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Vishnevite