An igneous rock that forms quickly, typically through rapid cooling of magma or lava, is likely to have a fine-grained texture. This means that the mineral crystals in the rock are small and not easily visible to the naked eye. Examples of fine-grained igneous rocks include basalt and rhyolite. In contrast, if the rock forms slowly, it tends to have a coarse-grained texture, with larger, more easily visible crystals, as seen in rocks like granite and diorite.
An igneous rock forms quickly. Which characteristic could the rock have?
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