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Igneous rocks are formed from minerals that have crystallized from magma. The minerals include quartz, feldspars, amphibole, micas, and the elements oxygen, silicon, iron, manganese, magnesium, and calcium among others.

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14y ago
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13y ago

Magma. The composition of the magma determines which kind of intrusive igneous rock forms. A felsic magma will form granite, a mafic magma will form gabbro.

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14y ago

granite and basalt

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14y ago

Magma or lava.

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Q: What is the major material composing igneous rocks?
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