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Quartz-gabbro

A rock classification type
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A gabbroic rock with the felsic minerals containing 5-20% quartz, <10% Alkali feldspar, and mostly calcic plagioclase. Mafic minerals: amphiboles, pyroxenes, olivine and biotite, can be abundant.


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Unique IdentifiersHide

Mindat ID:
48310
Long-form identifier:
mindat:1:1:48310:2

Similar NamesHide

Quartz gabbroA rock subtype

Classification of Quartz-gabbroHide

QAPF_P_10star.png

Quartz-gabbro is in section 10* of the QAPF diagram.

Sub-divisions of Quartz-gabbroHide

Mineralogy of Quartz-gabbroHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Mafic mineralsA petrological term for dark, rock-forming minerals rich in magnesium and/or iron.
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
PyroxeneA petrological term for Pyroxene Group.

Internet Links for Quartz-gabbroHide

References for Quartz-gabbroHide

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