Mineral - Grandidierite
Grandidierite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(Mg,Fe²⁺)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
Unit Cell
Physical Properties
Hardness
7.5
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
greenblue
Birefringence
Luster
Vitreous,
Pearly
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
Space Group
Habit
coarse, massive, prismatic
Formation
Metamorphose, Magmatisch
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Grandidierite