Mineral - Dufrénite
Dufrénite
Chemical Properties
Mineral Class
Phosphates
Toxicity
none
Formula
Ca₀,5Fe²⁺Fe³⁺₅(PO₄)₄(OH)₆ · 2H₂O
Unit Cell
Physical Properties
Hardness
3.5 - 4.5
Streak
graygreengreen grey
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackbrowngreen
Birefringence
Luster
Vitreous
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
spherical, radial, grape-shaped
Formation
Oxidationszone von Eisen-Lagerstätten, Metasomatose
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Dufrénite