Millerit

Structural context

Millerite
Crystal System trigonalCrystal Class ditrigonal pyramidalSpace Group R3m

Chemical context

Stoichiometric formulas

Millerite
mindat.org
  • March 13, 2023NiS
IMA
  • March 13, 2023NiS
mineralogy.rocks
  • Aug. 30, 2022NiS

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • pale brass-yellow
  • tarnish
  • greenish-grey
Color noteOriginal color note from the source
Pale brass-yellow, with an iridescent tarnish, and greenish-grey.
StreakStreak entities, recognized using a custom trained NER model
  • greenish black
Streak noteOriginal streak note from the source
Greenish black
Lustre
Metallic
Fracture
Irregular/Uneven
Transparency
Opaque
Luminescence
None
Tenacity
brittle
Hardness
3—3.5
Measured density
5.3—5.5
Calculated density
5.374