Mineral - Piemontite
Piemontite
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
Ca₂(Mn³⁺,Fe)(Al,Mn³⁺)₂[O|OH|SiO₄|Si₂O₇]
Unit Cell
Physical Properties
Hardness
6 - 6.5
Streak
pink
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackbrownred
Birefringence
Luster
Vitreous
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
leafy, prismatic, radial
Formation
Metamorphose, Magmatisch
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Piemontite