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Minerals - Eskolaite | TerraCollect
Mineral - Eskolaite
Eskolaite
Cr₂O₃
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
gray
green
green grey
Optical Properties
Color
black
green
green black
Birefringence
Luster
Vitreous,
Metallic
Transparency
translucent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Composition
Elements
Mass
Cr₂O₃
94,13
SiOâ‚‚
0,20
Al₂O₃
0,19
Fe₂O₃
0,55
V₂O₃
4,58
MnO
0,03
MgO
0,03
Density
Cleavage
Fracture
Tenacity
Point Group
Space Group
Habit
leafy,
blocky,
granular,
massive,
prismatic,
tabular
Formation
Metasomatose, in Skarnen und Metaquarziten
Paragenesis
Twinning
Rarity
Very rare
Synonyms
Eskolaite
Hâ‚‚O
0,10
Finnland
Groups and Members
Hämatit-Gruppe
