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Chemical composition. Especially when Basic\Mafic.

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13y ago

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Igneous rocks get darker as a result of higher concentrations of dark minerals like mafic minerals (e.g., biotite, amphibole, pyroxene) and higher levels of iron and magnesium. These minerals are more abundant in mafic igneous rocks, leading to their darker coloration compared to felsic igneous rocks, which have lower levels of these dark minerals. Heat also plays a role in darkening certain minerals through processes like metamorphism.

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10mo ago
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Q: What causes igneous rocks to get darker?
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