Andaluzita

Structural context

Andalusite
Crystal System orthorhombicCrystal Class orthorhombic dipyramidalSpace Group Pnnm

Chemical context

Stoichiometric formulas

Andalusite
mindat.org
  • March 13, 2023Al2(SiO4)O
IMA
  • March 13, 2023Al2SiO5
mineralogy.rocks
  • Aug. 30, 2022Al2O(SiO4)

Physical properties

ColorColor entities, recognized using a custom trained NER model
    • red brown
          • gray
            Color noteOriginal color note from the source
            Pink to red brown, occasionally yellow, green, white, gray rarely violet
            StreakStreak entities, recognized using a custom trained NER model
              Streak noteOriginal streak note from the source
              White
              Lustre
              Vitreous
              Sub-Vitreous
              Greasy
              Fracture
              Irregular/Uneven
              Sub-Conchoidal
              Transparency
              Transparent
              Translucent
              Opaque
              Tenacity
              brittle
              Hardness
              6.5—7.5
              Measured density
              3.13—3.21
              Calculated density
              3.149