Hornblende

AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
IMA symbol
Hbl
Also known as
  • Achromait
  • Achromaita
  • Achromaite
  • +18 more

Where it forms, where it's found

668recorded occurrences
Source · OpenStreetMap

Varieties

Synonyms

  • Achromait
  • Achromaita
  • Achromaite
  • Aluminous Amphibole
  • Amphibolite (of Breithaupt)
  • Cork Fossil
  • Gemeiner Hornblende
  • Hoornblende
  • Hornblände
  • Hornblenda
  • Horneblenda
  • Orneblenda
  • Orniblenda
  • Rimpylit
  • Rimpylita
  • Rimpylite
  • Sarvivälke
  • Speziait
  • Speziaita
  • Speziaite
  • Syntagmatite (of Breithaupt)

Group, growth & confusion

Often grow together
10 minerals

Literature, links & citation

Citations
  1. 1930Barnes, V.E. (1930) Changes in hornblende at about 800°. American Mineralogist: 15: 393-417.
  2. 1968Dodge, F.C.W. JJ. Papike & R.E. May (1968), Hornblendes from granitic rocks of the central Sierra Nevada batholith, California: Jour. Petrology: 9: 378-410.
  3. 1972Das Gupta, S. P. (1972) Coexisting hornblende and cummingtonite from the Khetri copper belt, Rajasthan, India. Mineralogical Magazine, 38 (299) 890-893 doi:10.1180/minmag.1972.038.299.13 DOI: 10.1180/minmag.1972.038.299.13
  4. 1973Robinson, K., Gibbs, G.V., Ribbe, P.H., Hall, M.R. (1973) Cation distribution in three hornblendes. American Journal of Science: 273A: 522-535.
  5. 1981Spear, F.S. (1981) An experimental study of hornblende stability and compositional variability in amphibolite. American Journal of Science: 281: 697-734.
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Hornblende — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/hornblende-1930},
  note      = {Accessed 2026-05-11}
}