Rocks

Igneous rocks.

Description

Pegmatite is a light-colored, extremely coarse-grained intrusive igneous rock.

Andesite is is a fine-grained, extrusive igneous rock composed mainly of plagioclase with other minerals such as hornblende, pyroxene and biotite.

Basalt is a fine-grained, dark-colored extrusive igneous rock composed mainly of plagioclase and pyroxene.

Peridotite is a coarse-grained intrusive igneous rock that is composed almost entirely of olivine.

Diorite is a coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende and sometimes quartz.

metamorphic rocks

Phyllite is a foliate metamorphic rock that is made up mainly of very fine-grained mica.

Amphibolite is a non-foliated metamorphic rock that forms through recrystallization under conditions of high viscosity and directed pressure.

Gneiss is a is foliated metamorphic rock that has a banded appearance and is made up of granular mineral grains.

Quartzite is a non-foliated metamorphic rock that is produced by the metamorphism of sandstone.

Hornfels is a fine-grained nonfoliated metamorphic rock with no specific composition.

sedimentary rocks

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