Mineral - Gormanite
Gormanite
Chemical Properties
Mineral Class
Phosphates
Toxicity
none
Formula
(Fe²⁺,Mg)₃(Al,Fe³⁺)₄(PO₄)₄(OH)₆ · 2H₂O
Unit Cell
Physical Properties
Hardness
4.5
Streak
green
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
greenblue
Birefringence
Luster
Vitreous,
Greasy
Transparency
Pleochroism
Geomineralogical Properties
Crystal System
triclinic
Point Group
Space Group
Habit
tufty, fibrous, radial
Formation
hydrothermal
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Gormanite