Alumite

Structural context

Alunite
Crystal System trigonalCrystal Class ditrigonal pyramidalSpace Group R3m

Chemical context

Stoichiometric formulas

Alunite
mindat.org
  • March 13, 2023KAl3(SO4)2(OH)6
IMA
  • March 13, 2023KAl3(SO4)2(OH)6
mineralogy.rocks
  • Aug. 30, 2022KAl3(SO4)2(OH)6

Physical properties

ColorColor entities, recognized using a custom trained NER model
    • gray
        • reddish brown
        Color noteOriginal color note from the source
        White, pale shades of gray, yellow, red, to reddish brown
        StreakStreak entities, recognized using a custom trained NER model
          Streak noteOriginal streak note from the source
          White
          Lustre
          Vitreous
          Pearly
          Fracture
          Irregular/Uneven
          Splintery
          Conchoidal
          Transparency
          Transparent
          Translucent
          Tenacity
          brittle
          Hardness
          3.5—4
          Measured density
          2.6—2.9
          Calculated density
          2.82