A type of rock that contains low density minerals such as quartz are igneous rocks.
Qualities of igneous rocks :
1) Felsic igneous rocks are light in color and are mostly made up of feldspars and silicates.
2) Common minerals found in felsic rock include quartz, plagioclase feldspar, potassium feldspar (orthoclase), and muscovite.
3) They may contain up to 15% mafic mineral crystals and have a low density.
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