Mineral - Berzeliite
Berzeliite
Chemical Properties
Mineral Class
Arsenates
Toxicity
middle
Formula
(NaCa₂)Mg₂(AsO₄)₃
Unit Cell
a=12.36 Z=8
Physical Properties
Hardness
4.5 - 5
Streak
whiteyellowyellow white
Density
Heavy (3,5-6)
Cleavage
Fracture
conchoidal,
uneven
Tenacity
Brittle
Optical Properties
Color
brownorangeyellow
Birefringence
Luster
Vitreous,
Greasy,
Resinous
Transparency
translucent,
transparent
Pleochroism
Geomineralogical Properties
Crystal System
isometric
Point Group
hexoctahedral - 4/m 3 2/m
Space Group
Ia 3 d (230)
Habit
coarse, massive
Formation
In metasomatically altered manganese-iron deposits
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Berzeliite
Composition
Elements
Mass
P₂O₅
1.23
As₂O₅
56.72
V₂O₅
0.23
SiO₂
0.66
FeO
0.01
MnO
2.83
PbO
0.35
MgO
13.60
CaO
19.27
Na₂O
4.56
K₂O
0.08
H₂O
0.71
Sweden (Palache et al.1952)
Groups and Members
Garnet-Supergroup
Berzeliite-Group