Mineral - Berthierite
Berthierite
Chemical Properties
Mineral Class
Sulfides and sulfosalts
Toxicity
none
Formula
FeSb₂S₄
Unit Cell
a=11.40 b=14.15 c=3.76 Z=4
Physical Properties
Hardness
2 - 3
Streak
browngraygray brown
Density
Heavy (3,5-6)
Cleavage
Indistinct
Fracture
splintery,
uneven
Tenacity
Brittle
Optical Properties
Color
blackgray
Birefringence
Luster
Metallic
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
orthorhombic-dipyramidal - 2/m 2/m 2/m
Space Group
Pnma (62)
Habit
fibrous, acicular, prismatic, radial
Formation
In hydrothermal ore deposits
Paragenesis
Twinning
Rarity
Rarely
Synonyms
Berthierite, Anglarite, Chazellite, Martourite
Composition
Elements
Mass
Fe
13.43
Mn
0.01
Sb
56.06
S
29.46
Romania (Palache et al. 1952)
Groups and Members
Berthierite-Group