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Igneous intrusive rocks - Coggle Diagram
Igneous intrusive rocks
Igneous rocks
Intrusive rocks: Intrusive igneous rocks are rocks that form from magma that has cooled below the Earth's surface.
Granite: Granite is rich in quartz, potassium feldspar and mica. It's the intrusive equivalent of rhyolite.
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Granodiorite: If compared with granite, granodiorite contains a lot more plagioclase than potassium feldspar and less quartz. It's the intrusive equivalent of dacite.
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Diorite: Diorite contains very little or sometimes no quartz. It also contains dark-coloured amphibole or pyroxene. It's the intrusive equivalent of andesite.
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Gabbro: Gabbro is a dark-coloured rock that contains abundant pyroxene and olivine and also some calcium-rich plagioclase. It's the intrusive equivalent of basalt.
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Pegmatite: A pegmatite is any igneous intrusive rock that have individual mineral grains that exceed 2 cm in size.
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Peridotite: Peridotite is easily identified because of it's green colour which is because of it's very large amount of olivine.
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Word definitions
Pyroxene: Are common in meteorites and extrusive igneous rocks, especially basalt. It's present in almost all igneous rocks.
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Plagioclase: A form of feldspar containing aluminosilicates of sodium and/or calcium common in igneous rocks and typically white.
Olivine: An olive-green, grey-green or brown mineral.
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Feldspar: An abundant rock-forming mineral typically occurring as colourless or pale-coloured crystals.
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