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Minerals - Piemontite | TerraCollect
Mineral - Piemontite
Piemontite
Ca₂(Mn³⁺,Fe)(Al,Mn³⁺)₂[O|OH|SiO₄|Si₂O₇]
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)
Optical Properties
Color
black
brown
red
Birefringence
Luster
Vitreous
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Cleavage
Fracture
Tenacity
Point Group
Space Group
Habit
leafy,
prismatic,
radial
Formation
Metamorphose, Magmatisch
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Piemontite
