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Quartz-diorite
A rock classification type
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About Quartz-diorite
A dioritic rock with 5-20% quartz and <5% of feldspars being alkali feldspar on the QAPF diagram.
A coarse grained igneous rock composed mostly of sodic plagioclase, with subordinate quartz, Kspar, and mafic minerals. It grades into quartz gabbro with increasing calcium content of plagioclase, tonalite with increasing quartz and diorite with decreasing quartz.
The coarse grained equivalent of dacite.
A coarse grained igneous rock composed mostly of sodic plagioclase, with subordinate quartz, Kspar, and mafic minerals. It grades into quartz gabbro with increasing calcium content of plagioclase, tonalite with increasing quartz and diorite with decreasing quartz.
The coarse grained equivalent of dacite.
Unique Identifiers
Mindat ID:
48251
Long-form identifier:
mindat:1:1:48251:0
Classification of Quartz-diorite
Quartz-diorite is in section 10* of the QAPF diagram.
Sub-divisions of Quartz-diorite
- Quartz-diorite
Mineralogy of Quartz-diorite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Silica > Quartz | SiO2 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Feldspar > Alkali Feldspar | A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium. |
Internet Links for Quartz-diorite
mindat.org URL:
https://www.mindat.org/min-48251.html
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References for Quartz-diorite
Reference List:
Mons Claudianus quarries, Wadi Umm Hussein, Red Sea Governorate, Egypt