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The cooling rate of the rock.

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14y ago
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6mo ago

The rate of cooling of the magma primarily determines the mineral grain size in an igneous rock. Rapid cooling results in fine-grained rocks, while slow cooling allows for the formation of coarse-grained rocks. Additionally, the composition of the magma and the presence of nucleation sites can also influence the final grain size.

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Q: What determines the mineral grain size in an igneous rock?
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