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Metamorphic, A metamorphic rock composed mainly of amphibole minerals and plagioclase feldspar

Metamorphic, A rock composed of one or more serpentine group minerals, formed by serpentinization

Metamorphic, A non-foliated rock formed from the metamorphism of limestone, composed primarily of calcite

Sedimentary, A rock composed predominantly of the mineral dolomite

Metamorphic, A high-grade metamorphic rock with a banded or foliated appearance

Sedimentary, A clastic rock composed mainly of sand-sized minerals or rock grains

Sedimentary, A hard, fine-grained sedimentary rock composed dominantly of silica

Metamorphic, A fine-grained rock that splits into thin, smooth-surfaced layers

Igneous, A very light and porous volcanic rock that forms during explosive eruptions

Sedimentary, A rock consisting of angular fragments of stones cemented by finer materials

Sedimentary, A soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite

Sedimentary, A fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments of other minerals

Sedimentary, Mostly composed of calcite and aragonite, which are different crystal forms of calcium carbonate

Igneous, A coarse-grained, intrusive igneous rock with a composition similar to basalt

Igneous, A coarse-grained intrusive rock composed mostly of quartz, feldspar, and mica

Metamorphic, A non-foliated metamorphic rock formed from sandstone and composed mostly of quartz

Metamorphic, A type of foliated metamorphic rock that is primarily composed of quartz, sericite mica, and chlorite

Igneous, A dense, coarse-grained igneous rock consisting mostly of the minerals olivine and pyroxene

Metamorphic, A fine-grained non-foliated metamorphic rock that is produced by contact metamorphism

Igneous, A coarse-grained intrusive igneous rock similar to basalt in its mineral composition

Igneous, A fine-grained extrusive rock that is rich in iron and magnesium

Sedimentary, A combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams

Sedimentary, A fine-grained sedimentary rock whose original constituents were clays or muds

Sedimentary, A coarse-grained rock that is composed mostly of rounded rock fragments within a finer-grained matrix

Metamorphic, A medium-grade metamorphic rock characterized by prominent schistosity and lamellar structures

Igneous, An extrusive volcanic rock with a high silica content

Igneous, A naturally occurring volcanic glass formed as an extrusive igneous rock

Igneous, An intermediate volcanic rock with a composition between basalt and rhyolite

Igneous, A type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption