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