Mineral - Barićite
Barićite
Chemical Properties
Mineral Class
Phosphates
Toxicity
none
Formula
(Mg,Fe)₃(PO₄)₂ · 8H₂O
Unit Cell
a=10.08 b=13.42 c=4.67 β=104° Z=2
Physical Properties
Hardness
1.5 - 2
Streak
whiteblueblue white
Density
Normal (2-3,5)
Cleavage
Perfect after {010}
Fracture
Tenacity
Elastic-flexible
Optical Properties
Color
graybluecolorless
Birefringence
0.040
Luster
Vitreous,
Pearly
Transparency
translucent,
opaque
Pleochroism
X: Blau
Y, Z: Farblos-Blau
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-prismatic - 2/m
Space Group
C2/m (12)
Habit
leafy, tabular
Formation
Secondary in sideritic shales
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Barićite
Composition
Elements
Mass
P₂O₅
31.28
Fe₂O₃
2.77
FeO
19.90
MnO
[2.95]
MgO
15.36
H₂O
28.96
Canada (Sturman 1976)
Groups and Members
Vivianite-Group
Barićit, Barićite