Samiksha Jaiswal (Editor)

Ferro ferri hornblende

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Crystal system
  
Monoclinic

Space group
  
C2/m

Category
  
Inosilicate Amphibole supergroup

Formula (repeating unit)
  
☐Ca2(Fe4Fe)(Si7Al)O22(OH)2

Crystal class
  
Prismatic (2/m) (same H-M symbol)

Unit cell
  
a = 9.93, b = 18.22 c = 5.32 [Å], β = 104.86° (approximated)

Ferro-ferri-hornblende is an amphibole-supergroup mineral with the formula ☐Ca2(Fe2+4Fe3+)(Si7Al)O22(OH)2. It contains essential vacancy (☐). It was discovered in the Traversella mine, Canavese, Torino, Piedmont, Italy.

References

Ferro-ferri-hornblende Wikipedia