Respuesta :
Rocks are made of minerals. Only a few minerals are rock forming and most rock is made from a combination of the commonest of these such as feldspars, quartz, mica, olivine, calcite, pyroxene and amphiboles.
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There are many minerals that are found in rocks are quartz, feldspar, micas, olivine, grenade, calcite, pyroxenes.
What is Mineral?
A mineral refers to the inorganic element having chemical composition and internal structure.
There are majority of rocks that are formed by combinations of a few common minerals that is known as rock-forming minerals. The minerals that found in rocks are quartz, feldspar, micas etc.
Thus, Quartz refers to the most common mineral found in a rock.
Learn more about Mineral here:
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