M
ineralogy.rocks
Explore
Blog
About
Contact
Picrochromite
The hypothetical Magnesium Chromium end-member of the Spinel series.
Structural context
Magnesiochromite
Crystal System
isometric
Crystal Class
hexoctahedral
Space Group
Fd-3m
Chemical context
Stoichiometric formulas
Picrochromite
mindat.org
March 13, 2023
MgCr
2
O
4
mineralogy.rocks
Aug. 30, 2022
MgCr
3+
2
O
4
Magnesiochromite
mindat.org
March 13, 2023
MgCr
2
O
4
Mg may be partially replaced by divalent Fe, and Cr by Al and trivalent Fe.
IMA
March 13, 2023
MgCr
2
O
4
mineralogy.rocks
Aug. 30, 2022
MgCr
3+
2
O
4
Physical properties
Color
Color entities, recognized using a custom trained NER model
deep red
Color note
Original color note from the source
Black, deep red
Streak
Streak entities, recognized using a custom trained NER model
Streak note
Original streak note from the source
Brown
Lustre
Greasy
Metallic
Sub-Metallic
Fracture
Irregular/Uneven
Hackly
Sub-Conchoidal
Transparency
Opaque
Tenacity
brittle
Hardness
5.5
Measured density
4.1—4.3
Calculated density
4.43
Picrochromite | mineralogy.rocks