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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 informationHide

Age range:
Paleoproterozoic to Neogene : 1606 Ma to 11.0 ± 0.8 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
111.0 ± 0.8 MaMiocene40Ar/39Ar
214.8 ± 0.6 MaMioceneK-Ar
315.1 ± 0.5 MaMioceneK-Ar
415.7 ± 0.6 MaMioceneK-Ar
515.8 ± 0.5 MaMioceneK-Ar
616.6 ± 0.8 MaMioceneK-Ar
716.8 ± 0.5 MaMioceneK-Ar
816.9 ± 0.7 MaMioceneK-Ar
9102 to 94.8 MaCretaceousK-Ar
10113 ± 3 MaEarly CretaceousK-Ar
11280 ± 3 MaCisuralianAr-Ar
12286.6 ± 6.7 MaCisuralianAr–Ar
13301 ± 10 MaPennsylvanianK-Ar
14534 ± 16 MaTerreneuvianRb-Sr
151170 ± 24 MaStenianK-Ar
161573 ± 5 MaCalymmianAr-Ar
171606 to 1593 MaProterozoicAr-Ar
Sample references:
IDLocalityReference
1Roşia Montană, Roşia Montanã Commune, Alba Co., RomaniaManske S, Ullrich T, Reynolds T J, O'Connor G (2004): Vein sets and hydrothermal alteration in the Cetate-Cârnic Area, Ro?ia Montan? District, Romania. Romanian Journal of Mineral Deposits, Special Issue. Gold in the Metaliferi Mountains 81, 122-125.
2Tonopah District, San Antonio Mts, Nye Co., Nevada, USASilberman, M. L., Bonham, H. F. Jr., Garside, L. J., Ashley, R. P. (1978) Radiometric ages of volcanic and plutonic rocks and hydrothermal alteration-mineralization in the Tonopah Mining District and vicinity, Nye and Esmerelda Counties, Nevada. United States Department of the Interior Geological Survey Open-File Report 78-841. 1-48.
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9Fanjah, Sib, Muscat Province, OmanGnos, E. & Peters, T. (1993) K-Ar ages of the metamorphic sole of the Semail ophiolite: implications for ophiolite cooling history. Contributions to Mineralogy and Petrology, 113(3), 325-332.
10Lone Mountain District, Esmeralda Co., Nevada, USASilberman, M. L., Bonham, H. F. Jr., Garside, L. J., Ashley, R. P. (1978) Radiometric ages of volcanic and plutonic rocks and hydrothermal alteration-mineralization in the Tonopah Mining District and vicinity, Nye and Esmerelda Counties, Nevada. United States Department of the Interior Geological Survey Open-File Report 78-841. 1-48.
11Maksut Cu-Ni deposit, Maksut, Eastern Kazakhstan Province, KazakhstanKhromykh, S. V., Vladimirov, A. G., Izokh, A. E., Travin, A. V., Prokop’ev, I. R., Azimbaev, E., & Lobanov, S. S. (2013). Petrology and geochemistry of gabbro and picrites from the Altai collisional system of Hercynides: Evidence for the activity of the Tarim plume. Russian Geology and Geophysics, 54(10), 1288-1304.
12Sayak Cu ore field, Sayak, Balkhash Region, Karagandy Province, KazakhstanChen, X., Seitmuratova, E., Wang, Z., Chen, Z., Han, S., Li, Y., ... & Shi, W. (2014). SHRIMP U–Pb and Ar–Ar geochronology of major porphyry and skarn Cu deposits in the Balkhash Metallogenic Belt, Central Asia, and geological implications. Journal of Asian Earth Sciences, 79, 723-740.
13Belorechenskoe deposit, Adygea Republic, Northern Caucasus Region, RussiaSomin, M. L., Levchenkov, O. A., Kotov, A. B., Makeev, A. F., Komarov, A. N., Ro, N. I., ... & Lebedev, V. A. (2007, October). The Paleozoic age of high-pressure metamorphic rocks in the Dakhov Salient, northwestern Caucasus: Results of U-Pb geochronological investigations. In Doklady Earth Sciences, 416(1), 1018-1021
14Chapada Cu deposit, Uruaçu, Goiás, BrazilRichardson S V, Jones L M, Kesler S E (1988) Strontium isotopic geochemistry of Pan-African/Brasiliano rocks, Chapada copper deposit, Goiás, Brazil, Geologische Rundschau, 77, 763-772
15Nemegos carbonatite, Lackner Township, Sudbury District, Ontario, CanadaOrris, G. J., Grauch, R. I. (2002) Rare Earth element mines, deposits, and occurenes. USGS Open-File Report 02-189, 1-174.
16Coppin Pool, Tom Price, Ashburton Shire, Western Australia, AustraliaHarrison T M, McDougall I (1981) Excess 40Ar in metamorphic rocks from Broken Hill, New South Wales: implications for 40Ar/39Ar age spectra and the thermal history of the region, Earth and Planetary Science Letters, 55, 123-149
17Broken Hill, Yancowinna Co., New South Wales, AustraliaFrost B R, Swapp S M, Gregory R W (2005) Prolonged existence of sulfide melt in the Broken Hill orebody, New South Wales, Australia, The Canadian Mineralogist, 43, 479-493

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 (items highlighted in red)
Common component of (items highlighted in red)

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