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The Rock Cycle
Igneous Rocks
Metamorphic Rocks
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Gneiss is a metamorphic rock formed into light and dark crystalline bands
Phyllite is a large-crystalled metamorphic rock
Slate is a dull grey, brittle metamorphic rock which is very useful
Marble is a mainly white metamorphic rock formed from limestone
Schist is a metamorphic rock with crystals of varying colours
Quartzite is a uniform colored metamorphic rock which is usually white
Granite is a large crystalled, intrusive igneous rock
Obsidian is a brittle extrusive igneous rock with miniature crystals.
Rhyolite is an extrusive igneous rock containing quartz crystals
Dolerite is an extrusive igneous rock with minuscule crystals
Sandstone is a sedimentary rock formed of compressed sand grains
Limestone is a sedimentary rock with the chemical composition calcium carbonate