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⇱ Quartz-rich-coarse-grained-crystalline-rock: Mineral information, data and localities.

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Quartz-rich-coarse-grained-crystalline-rock

A rock classification type
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Quartz-rich (>60%) coarse-grained crystalline igneous rock. They usually include some feldspars and micas and/or amphiboles. It is subdivided into quartzolite (>90% quartz) and Quartz-rich granitic rock (60-90% quartz).

In many cases these rocks may be hydrothermally altered granitoids (i.e greisens) rather than true igneous rocks.


Unique IdentifiersHide

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Mindat ID:
48122
Long-form identifier:
mindat:1:1:48122:9

Classification of Quartz-rich-coarse-grained-crystalline-rockHide

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👁 QAPF_P_1,1a.png

Rocks in section 1 (including 1a) on the QAPF diagram.

Sub-divisions of Quartz-rich-coarse-grained-crystalline-rockHide

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Mineralogy of Quartz-rich-coarse-grained-crystalline-rockHide

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Essential minerals - these are minerals that are required within the classification of this rock:
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole(Na, K, ◻)(Ca,Na)2(Mg,Fe,Al)5((Si,Al)8O22)(OH,F,Cl,O)2
Feldspar > Alkali FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Feldspar > Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MicaA petrological term for Mica Group.

Internet Links for Quartz-rich-coarse-grained-crystalline-rockHide

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References for Quartz-rich-coarse-grained-crystalline-rockHide

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Reference List:
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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