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Hornblende-gabbro
A rock classification type
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About Hornblende-gabbro
A variety of gabbro in which primary hornblende occurs.
Now defined modally in the gabbroic rock classification.
Now defined modally in the gabbroic rock classification.
Unique Identifiers
Mindat ID:
48287
Long-form identifier:
mindat:1:1:48287:5
Classification of Hornblende-gabbro
Gabbro is in section 10 of the QAPF diagram.
Mineralogy of Hornblende-gabbro
Essential minerals - these are minerals that are required within the classification of this rock:
| Amphibole > Hornblende | AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2 |
| Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Pyroxene | A petrological term for Pyroxene Group. |
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| SiO2 | 34.14 % |
| Al2O3 | 13.4 % |
| TiO2 | 5.27 % |
| Fe2O3 | 2.00 % |
| FeO | 15.86 % |
| MgO | 9.63 % |
| MnO | 0.19 % |
| Na2O | 2.21 % |
| CaO | 13.05 % |
| K2O | 0.72 % |
| P2O5 | 1.77 % |
| Total: | 98.24 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Mont Royal, MontrÃĐal, QuÃĐbec, Canada | Wet chemical analysis by G. Woussen and B.M.Gunn. The Fe2O3 percentage is arbitrarily set to 2%. |
Synonyms of Hornblende-gabbro
Common Associates
Associations Based on Photo Data:
| 1 photo of Hornblende-gabbro associated with 'Hornblende' | AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2 |
| 1 photo of Hornblende-gabbro associated with Anorthite | Ca(Al2Si2O8) |
| 1 photo of Hornblende-gabbro associated with Tremolite | âŧCa2Mg5(Si8O22)(OH)2 |
| 1 photo of Hornblende-gabbro associated with Titanite | CaTi(SiO4)O |
| 1 photo of Hornblende-gabbro associated with Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| 1 photo of Hornblende-gabbro associated with Albite | Na(AlSi3O8) |
| 1 photo of Hornblende-gabbro associated with Pyrite | FeS2 |
Internet Links for Hornblende-gabbro
mindat.org URL:
https://www.mindat.org/min-48287.html
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References for Hornblende-gabbro
Reference List:
Lady of the Lake Complex Occurrence, Madison County, Montana, USA