What is Monomineralic Rock?

Quartzite. Credit: Museum of Geology at University of Tartu collection

Monomineralic rocks are rocks that are composed of only one mineral.

Examples of Monomineralic Rock

Monomineralic igneous rocks are dunite (more than 90% olivine) and anorthosite (more than 90% plagioclase feldspar).

Common monomineralic metamorphic rocks are marble and quartzite although they do not need necessarily to be monomineralic. Similar is the situation with their sedimentary protoliths – limestone and sandstone which may be very pure.