Mineral - Osumilite
Osumilite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
K □2Fe²⁺₂Al₃[Al₂Si₁₀O₃₀]
Unit Cell
Physical Properties
Hardness
5 - 6
Streak
white
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackblue
Birefringence
Luster
Vitreous
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
hexagonal
Point Group
Space Group
Habit
leafy, prismatic, tabular
Formation
Magmatisch, Vulkanisch, Metamorphose
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Osumilite