Mineral - Eskolaite
Eskolaite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Cr₂O₃
Unit Cell
a=4,97 c=13,57 Z=6
Physical Properties
Hardness
8 - 8.5
Streak
graygreengreen grey
Density
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackgreengreen black
Birefringence
Luster
Vitreous,
Metallic
Transparency
translucent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Point Group
Space Group
Habit
leafy, blocky, granular, massive, prismatic, tabular
Formation
Metasomatose, in Skarnen und Metaquarziten
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Eskolaite
Composition
Elements
Mass
Cr₂O₃
94,13
SiO₂
0,20
Al₂O₃
0,19
Fe₂O₃
0,55
V₂O₃
4,58
MnO
0,03
MgO
0,03
H₂O
0,10
Finnland
Groups and Members
Hämatit-Gruppe