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Answer:
Monomineralic rocks, as the name suggests, are rocks that are composed of only one mineral. Majority of rocks are composed of several different minerals and absolutely pure monomineralic rocks do not exist in nature anyway. But some of them are reasonably ‘pure’ to be called monomineralic.
Example of monomineralic rocks:
Dunite is composed of almost pure forsterite. Gusdal Quarry, Møre og Romsdal, Norway. Width of sample 9 cm.
Anorthosite. Rogaland, Norway. Width of sample 13 cm.
Anorthosite. Rogaland, Norway. Width of sample 13 cm.Anorthosite is a common rock type on the Moon where the highlands surrounding the darker maria are composed of this rock type. But it also occurs here on Earth although it is not distributed as widely here. The existence of this rock type is no accident because its constituent mineral plagioclase feldspar is the most common mineral in the Earth’s crust.
Carbonatite (sövite). Alnö Island, Sweden. Width of sample 8 cm.
Carbonatite (sövite). Alnö Island, Sweden. Width of sample 8 cm.Carbonatite is a rare igneous rock with an exotic composition. It is composed of carbonate minerals (>50%) which makes it compositionally very similar to sedimentary limestone and metamorphic marble. Its appearance may also very much resemble that of marble.
Pyroxenite. Aust-Agder, Norway. Width of sample 8 cm.
Pyroxenite. Aust-Agder, Norway. Width of sample 8 cm.Pyroxenite is an ultramafic rock just as dunite. It may contain significant amount of olivine (up to 40%) but the sample above is mostly composed of almost pure clinopyroxene.
Quartzite. Telemark, Norway. Width of sample 9 cm.
Quartzite. Telemark, Norway. Width of sample 9 cm.Quartzite is a common metamorphic rock just as its sedimentary protolith sandstone. Many quartzite samples are composed of almost pure interlocking mass of fused quartz grains just as the sample above.
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