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Hornblende

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Hardness:
6
Specific Gravity:
3 - 3.4
Name:
Named in 1789 by Abraham Gottlieb Werner from an old German term for dark minerals with no ore value and from "blende", meaning to deceive.
An informal name for dark green to black amphiboles, mostly ferro-hornblende or magnesio-hornblende according to the current nomenclature.
In the book "Rock-forming minerals, volume 2b, double chain silicates" by Deer, Howie & Zussman (1997), the term "hornblende" is used as a group name for all aluminous amphiboles in the calcium amphibole subgroup.


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Physical Properties of HornblendeHide

Streak:
Colorless
Hardness:
Density:
3 - 3.4 g/cm3 (Measured)    

Age distributionHide

Recorded ages:
Paleoproterozoic to Neogene : 1606 Ma to 11.0 ± 0.8 Ma - based on 17 recorded ages.

Synonyms of HornblendeHide

Other Language Names for HornblendeHide

Varieties of HornblendeHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Titanite23 photos of Hornblende associated with Titanite on mindat.org.
Calcite21 photos of Hornblende associated with Calcite on mindat.org.
Microcline19 photos of Hornblende associated with Microcline on mindat.org.
Apatite18 photos of Hornblende associated with Apatite on mindat.org.
Fluorapatite16 photos of Hornblende associated with Fluorapatite on mindat.org.
Quartz15 photos of Hornblende associated with Quartz on mindat.org.
Epidote15 photos of Hornblende associated with Epidote on mindat.org.
Hydroxylapatite14 photos of Hornblende associated with Hydroxylapatite on mindat.org.
Albite-Anorthite Series12 photos of Hornblende associated with Albite-Anorthite Series on mindat.org.
Sanidine11 photos of Hornblende associated with Sanidine on mindat.org.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Hornblende in petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

References for HornblendeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Barnes, V.E. (1930) Changes in hornblende at about 800°. American Mineralogist: 15: 393-417.
Dodge, 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.
Robinson, K., Gibbs, G.V., Ribbe, P.H., and Hall, M.R. (1973) Cation distribution in three hornblendes. American Journal of Science: 273A: 522-535.
Spear, F.S. (1981) An experimental study of hornblende stability and compositional variability in amphibolite. American Journal of Science: 281: 697-734.
Litvin, M.A., Platonov, A.N., and Khomenko, V.M. (1986) Effect of titanium isomorphic impurity on the colour and pleochroism of hornblende. Mineralogicheskii Sbornik Lvov: 40: 30-36.
Hawthorne, Frank C. and Roberta Oberti (2006): On the classification of amphiboles: Canadian Mineralogist: 44(1), 1-21.

Internet Links for HornblendeHide

Localities for HornblendeHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow