Mineral - Ferroberaunite
Ferroberaunite
Chemical Properties
Mineral Class
Phosphates
Toxicity
none
Formula
Fe²⁺Fe³⁺₅(PO₄)₄(OH)₅ · 6H₂O
Unit Cell
a=20,87 b=5,16 c=19,23 β=94° Z=4
Physical Properties
Hardness
3 - 4
Streak
graygreengreen grey
Density
Normal (2-3,5)
Cleavage
nd
Fracture
nd
Tenacity
Brittle
Optical Properties
Color
graygreengreen grey
Birefringence
0,050
Luster
Vitreous,
Pearly
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
tufty, hair-like, spherical, acicular, radial, prismatic, radial
Formation
Oxidationszone von Eisen-Lagerstätten, sekundär aus Triphylit im Granitpegmatit
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Ferroberaunite
Composition
Elements
Mass
P₂O₅
31,26
Al₂O₃
0,01
Fe₂O₃
43,97
FeO
7,91
H₂O
16,86
New Jersey
Groups and Members
Beraunit-Gruppe