Augit

Structural context

Augite
Crystal System monoclinicCrystal Class prismaticSpace Group C2/c

Chemical context

Stoichiometric formulas

Augite
mindat.org
  • March 13, 2023(CaxMgyFez)(Mgy1Fez1)Si2O6Where 0.4 ≤ x ≤ 0.9, x+y+z=1 and y1+z1=1 This formula is based on the definition by Morimoto et al. (1988)
IMA
  • March 13, 2023(Ca,Mg,Fe)2Si2O6
mineralogy.rocks
  • Aug. 30, 2022(Ca,Mg,Fe2+,Fe3+)2(Si,Al)2O6

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • brown-green
  • green-black
  • purplish brown
Color noteOriginal color note from the source
Brown-green, black, green-black, brown, purplish brown
StreakStreak entities, recognized using a custom trained NER model
  • greenish gray
  • dark brown
Streak noteOriginal streak note from the source
Greenish gray, light to dark brown
Lustre
Vitreous
Fracture
Irregular/Uneven
Sub-Conchoidal
Transparency
Translucent
Opaque
Tenacity
brittle
Hardness
5.5—6
Measured density
3.19—3.56
Calculated density
3.31