Orthopyroxene Subgroup

A subgroup name for orthorhombic Pyroxene Group minerals. Compare Clinopyroxene Subgroup. The most common member in rocks is enstatite.

History

Activities related to discovery and approval of the group members

Structural context

Orthorhombic System
177 measurement(s) or 97.79%8 member(s) or 88.89%
Unclassified
4 measurement(s) or 2.21%1 member(s) or 11.11%
a5.1815—18.614 (17.1407)
b7.467—18.2321 (8.9064)
c4.908—22.607 (5.3205)
alpha90—115.32 (90.1431)
beta80.56—109.41 (91.2204)
gamma90—95.49 (90.031)
volume381.496—997.26 (795.6906)

Based on 177 measurements
Bronzite
Donpeacorite
Enstatite
Enstatite-Ferrosilite Series
Ferrosilite
Lime-Bronzite
Protoenstatite
Vanadinbronzite

Chemical context

Stoichiometric formulas

Orthopyroxene Subgroup
mineralogy.rocks
  • Aug. 30, 2022ABSi2O6

Elements recorded on EPMA

176
O
176
Si
156
Mg
114
Fe
72
Ca
53
Al
22
Mn
17
Ti
3
Cr
3
Li
1
Co
1
Cu

Physical properties

ColorColor entities, recognized using a custom trained NER model
2
  • dark brown
1
  • yellowish green
1
    1
    • yellow-orange
    1
    • pale
    1
    • faint pink
    1
      1
      • greenish white
      Color noteOriginal color note from the source
      Dark brown to black; Pale buff, yellow-orange; faint pink in thin section.; White, yellowish green, brown, greenish white or grey, olive-green
      StreakStreak entities, recognized using a custom trained NER model
      1
      • pale gray brown
      1
        1
          Streak noteOriginal streak note from the source
          Grey to white; Pale gray brown
          Lustre
          • Pearly1
          • Vitreous3
          • Sub-Vitreous1
          • Greasy1
          Fracture
          • Irregular/Uneven2
          • Splintery1
          Transparency
          • Opaque1
          • Transparent1
          • Translucent3
          Luminescence
          Non-fluorescent
          Tenacity
          • brittle2
          Hardness