Ferro-gedrite

Forms a series with gedrite.

History

Activities related to discovery and approval of the group members

Structural context

Ferro-gedrite
Crystal System orthorhombicCrystal Class orthorhombic dipyramidalSpace Group Pnma
a18.5—18.578 (18.539)
b17.8—17.937 (17.8685)
c5.276—5.315 (5.2955)
alpha90
beta90
gamma90
volume1737.387—1771.137 (1754.262)

Based on 2 measurements

Chemical context

Stoichiometric formulas

Ferro-gedrite
mindat.org
  • March 13, 2023◻{Fe2+2}{Fe2+3Al2}(Al2Si6O22)(OH)2The gedrite group are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)>1 apfu Ferro-gedrite is defined with Fe2+ as the dominant element both in the B and C2+ positions and Al in the C3+ position.
IMA
  • March 13, 2023◻Fe2+2(Fe2+3Al2)(Si6Al2)O22(OH)2
mineralogy.rocks
  • Aug. 30, 2022[box]Fe2+2(Fe2+3Al2)(Si6Al2)O22(OH)2

Elements recorded on EPMA

1
Al
1
Ca
1
Fe
1
H
1
Mg
1
Mn
1
Na
1
O
1
Si
1
Ti

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • pale greenish-grey
    Color noteOriginal color note from the source
    Pale greenish-grey to brown
    StreakStreak entities, recognized using a custom trained NER model
      Streak noteOriginal streak note from the source
      White
      Lustre
      Vitreous
      Luminescence
      Nonfluorescent
      Hardness
      5.5—6