Brossit

Structural context

Dolomite
Crystal System trigonalCrystal Class rhombohedralSpace Group R-3

Chemical context

Stoichiometric formulas

Brossit
mindat.org
  • March 13, 2023CaMg(CO3)2
Dolomite
mindat.org
  • March 13, 2023CaMg(CO3)2Ca can exist in excess of up to 0.25 apfu in non-stoichiometric dolomite (Nascimento dos Santos et al., 2017).
IMA
  • March 13, 2023CaMg(CO3)2
mineralogy.rocks
  • Aug. 30, 2022CaMg(CO3)2

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • colourless
  • colourless
  • reddish-white
  • brownish-white
  • gray
    Color noteOriginal color note from the source
    Colourless, white, gray, reddish-white, brownish-white, or pink; colourless in transmitted light
    StreakStreak entities, recognized using a custom trained NER model
      Streak noteOriginal streak note from the source
      White
      Lustre
      Vitreous
      Sub-Vitreous
      Resinous
      Waxy
      Pearly
      Fracture
      Sub-Conchoidal
      Transparency
      Transparent
      Translucent
      Luminescence
      None
      Tenacity
      brittle
      Hardness
      3.5—4
      Measured density
      2.84—2.86
      Calculated density
      2.876