Corundumite
Structural context
Corundum
Crystal System trigonalCrystal Class hexagonal scalenohedralSpace Group R-3c
Chemical context
Stoichiometric formulas
Corundum
mindat.org
- March 13, 2023Al2O3
IMA
- March 13, 2023Al2O3
mineralogy.rocks
- Aug. 30, 2022Al2O3
Physical properties
ColorColor entities, recognized using a custom trained NER model
- colourless
- golden-brown
Color noteOriginal color note from the source
Colourless, blue, red, pink, yellow, grey, golden-brown
StreakStreak entities, recognized using a custom trained NER model
Streak noteOriginal streak note from the source
White
Lustre
Adamantine
Vitreous
Pearly
Fracture
Irregular/Uneven
Conchoidal
Transparency
Transparent
Translucent
Opaque
Tenacity
brittle
Hardness
9
Measured density
3.98—4.1
Calculated density
3.997