Mineral - Helvine
Helvine
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Mn₄[S|(BeSiO₄)₃][
Unit Cell
Physical Properties
Hardness
6 - 6.5
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
brownredyellow
Birefringence
Luster
Vitreous
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
Space Group
Habit
dodecahedron, Tetrahedron
Formation
Magmatisch, hydrothermal
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Helvine