Coronit

Structural context

Dravite
Crystal System trigonalCrystal Class ditrigonal pyramidalSpace Group R3m

Chemical context

Stoichiometric formulas

Dravite
mindat.org
  • March 13, 2023NaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
IMA
  • March 13, 2023NaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
mineralogy.rocks
  • Aug. 30, 2022NaMg3Al6(Si6O18)(BO3)3(OH)3OH

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • pale brown
  • dark-brown
  • brownish-black
  • dark-yellow
    Color noteOriginal color note from the source
    Pale brown to dark-brown to brownish-black, also dark-yellow, blue.
    StreakStreak entities, recognized using a custom trained NER model
    • light brown
      Streak noteOriginal streak note from the source
      Light brown, rarely white.
      Lustre
      Vitreous
      Resinous
      Fracture
      Irregular/Uneven
      Conchoidal
      Transparency
      Transparent
      Translucent
      Luminescence
      May fluoresce yellow to orange in swuv, due to minor iron content.
      Tenacity
      brittle
      Hardness
      7
      Measured density
      3.03—3.18
      Calculated density
      3.038