Gabbroid
A rock classification type
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About Gabbroid
A field term for coarse-grained crystalline rocks with <90% mafics, and calcic plagioclase dominant.
Unique Identifiers
Mindat ID:
48265
Long-form identifier:
mindat:1:1:48265:3
Classification of Gabbroid
float='left'>Gabbroic rocks are in sections 9,9*,9',10,10* and 10' of the QAPF diagram.
Sub-divisions of Gabbroid
- Gabbroid
- Calcogranitone
- Drusite
- Quartz-monzogabbro
- Monzogabbro
- Foid-bearing-monzogabbro
- Quartz-gabbro
- Gabbro
- Cumulitic gabbro
- Orbicular gabbro
- Clinopyroxene-gabbro
- Olivine-gabbro
- Gabbronorite
- Olivine-gabbronorite
- Pyroxene-hornblende-gabbronorite
- Hornblende-gabbro
- Norite
- Clinopyroxene-norite
- Olivine-clinopyroxene norite
- Olivine-norite
- Pyroxene-hornblende-norite
- Olivine-orthopyroxene-gabbro
- Orthopyroxene-gabbro
- Pyroxene-hornblende-gabbro
- Troctolite
- Gabbrodiorite
- Leucogabbro
- Melagabbro
- Quartz-norite
- Microgabbro
- Pegmatitic gabbro
- Quartz gabbro
- Anorthitissite
- Ferrogabbro
- Foid-bearing-gabbro
- Foid-bearing gabbroic-rock
Mineralogy of Gabbroid
Essential minerals - these are minerals that are required within the classification of this rock:
| Calcic plagioclase | A petrological term for plagioclase series feldspars dominant in calcium. |
| Mafic minerals | A petrological term for dark, rock-forming minerals rich in magnesium and/or iron. |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole > Hornblende | AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2 |
| Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Synonyms of Gabbroid
Internet Links for Gabbroid
mindat.org URL:
https://www.mindat.org/min-48265.html
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References for Gabbroid
Reference List:
Gabbro Quarry, Radau valley, Bad Harzburg, Goslar District, Lower Saxony, Germany