Ferrosilite

Enstatite-Ferrosilite Series Note: The name has been used in the past to describe the monoclinic dimorph clinoferrosilite, with the orthorhombic dimorph having the name orthoferrosilite so be careful when reading older texts.

History

Activities related to discovery and approval of the group members

Structural context

Ferrosilite
Crystal System orthorhombicCrystal Class orthorhombic dipyramidalSpace Group Pbca
a6.628—18.614 (17.1856)
b7.467—9.172 (8.9681)
c5.1201—22.607 (5.6078)
alpha90—115.32 (90.5504)
beta80.56—107.39 (91.5743)
gamma90—95.49 (90.1193)
volume444.07—997.26 (821.6332)

Based on 46 measurements

Chemical context

Stoichiometric formulas

Ferrosilite
mindat.org
  • Sept. 14, 2023Fe2+2Si2O6Simplified: FeSiO^3.
  • March 13, 2023FeSiO3
IMA
  • March 13, 2023Fe2+2Si2O6
mineralogy.rocks
  • Aug. 30, 2022Fe2+2(Si2O6)

Elements recorded on EPMA

46
Fe
46
O
46
Si
28
Ca
26
Mg
11
Al
1
Mn
1
Ti

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • dark brown
    Color noteOriginal color note from the source
    Dark brown to black
    StreakStreak entities, recognized using a custom trained NER model
    • pale gray brown
    Streak noteOriginal streak note from the source
    Pale gray brown
    Lustre
    Vitreous
    Sub-Vitreous
    Greasy
    Fracture
    Irregular/Uneven
    Splintery
    Transparency
    Transparent
    Translucent
    Tenacity
    brittle
    Hardness
    5—6
    Measured density
    3.6—4
    Calculated density
    4