Mineral - Frondelite
Frondelite
Chemical Properties
Mineral Class
Phosphates
Toxicity
none
Formula
Mn²⁺Fe³⁺₄(PO₄)₃(OH)₅
Unit Cell
Physical Properties
Hardness
4.5
Streak
browngreen
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
brownredorange
Birefringence
Luster
Vitreous,
Earthy
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
Space Group
Habit
fibrous, acicular, radial
Formation
Sekundär in Pegmatiten
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Frondelite