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How are minerals related to rocks?
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geology
A rock formation called “faux amphibolite,” from the Nuvvuagittuq greenstone belt in northern Quebec, dated to 4.28 billion years ago.
In geology, minerals and rocks are fundamentally related as the building blocks of the solid Earth. A rock is defined as a naturally occurring, coherent aggregate of one or more minerals.12
While there are thousands of known mineral species, only about 100 are considered rock-forming minerals, as they constitute the major components of most rocks. The relationship between the two is central to geological classification:3
- Composition: Rocks are often classified based on their mineralogical attributes. For example, granite is identified by its specific assemblage of minerals, such as feldspar, quartz, mica, and amphibole.2
- Formation: The specific minerals present in a rock are controlled by the chemical environment and the physical conditions—such as pressure and temperature—under which the rock formed.4
- Analysis: In cases where a rock's mineral grains are too fine to be seen, geologists may use chemical analysis to calculate a "norm," or a hypothetical mineral composition, to classify the rock.5