The crystal size of an igneous rock is described as its texture.
Igneous rock may be defined as a type of rock that arises due to the solidification of cooled magma.
The texture of an igneous rock is dependent on the rate of cooling of the magma. Slow cooling of magma gives rise to large crystals, while fast cooling gives rise to small crystals.
Therefore, the crystal size of an igneous rock is described as its texture.
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