Braunit

Structural context

Braunite
Crystal System tetragonalCrystal Class ditetragonal dipyramidalSpace Group I41/acd

Chemical context

Stoichiometric formulas

Braunite
mindat.org
  • March 13, 2023Mn2+Mn3+6(SiO4)O8
IMA
  • March 13, 2023Mn2+Mn3+6O8(SiO4)
mineralogy.rocks
  • Aug. 30, 2022Mn2+Mn3+6(SiO4)O8

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • brownish black
  • steel-grey
Color noteOriginal color note from the source
Brownish black, steel-grey
StreakStreak entities, recognized using a custom trained NER model
    Streak noteOriginal streak note from the source
    Black
    Lustre
    Sub-Metallic
    Fracture
    Irregular/Uneven
    Sub-Conchoidal
    Transparency
    Opaque
    Tenacity
    brittle
    Hardness
    6—6.5
    Measured density
    4.72—4.83
    Calculated density
    4.86