Mineral - Eosphorite
Eosphorite
Chemical Properties
Mineral Class
Phosphates
Toxicity
none
Formula
Mn²⁺Al[(OH)₂|PO₄]·H₂O
Unit Cell
a=10.46 b=13.50 c=6.93 Z=8
Physical Properties
Hardness
5
Streak
white
Density
Normal (2-3,5)
Cleavage
Indistinct after {100}
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
brownredcolorless
Birefringence
0.035
Luster
Vitreous,
Greasy
Transparency
translucent,
transparent
Pleochroism
X: Braun-Gelb
Y: Rosa
Z: Rosa-Farblos
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
orthorhombic-dipyramidal - 2/m 2/m 2/m
Space Group
Cmce (64)
Habit
acicular, prismatic, prismatic, tabular
Formation
Pegmatites (Phosphate-rich)
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Eosphorite
Composition
Elements
Mass
P₂O₅
29.89
Al₂O₃
22.37
FeO
1.38
MnO
29.94
H₂O
15.34
USA (Palache et al. 1952)