Penroseite

Pyrite Group.

History

Activities related to discovery and approval of the group members

Structural context

Penroseite
Crystal System isometricCrystal Class diploidalSpace Group Pa-3
a5.901—5.9629 (5.932)
b5.901—5.9629 (5.932)
c5.901—5.9629 (5.932)
alpha90
beta90
gamma90
volume205.483—212.018 (208.7505)

Based on 2 measurements

Chemical context

Stoichiometric formulas

Penroseite
mindat.org
  • March 13, 2023(Ni,Co,Cu)Se2Puse NiSe2 is known as a synthetic phase (see also kullerudite).
IMA
  • March 13, 2023(Ni,Co,Cu)Se2
mineralogy.rocks
  • Aug. 30, 2022(Ni,Co,Cu)Se2

Elements recorded on EPMA

2
Ni
2
Se
1
P

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • steel-gray
Color noteOriginal color note from the source
Steel-gray
StreakStreak entities, recognized using a custom trained NER model
    Streak noteOriginal streak note from the source
    Black
    Lustre
    Metallic
    Fracture
    Sub-Conchoidal
    Transparency
    Opaque
    Tenacity
    brittle
    Hardness
    2.5—3
    Measured density
    6.58—6.74
    Calculated density
    6.7