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What is the most important factor affecting the texture of an igneous rock?
Wiki User
∙ 13y ago
The rate at which the lava or magma cools affects the grain size, or texture, of the rock. The faster a rock cools, the smaller the individual mineral grains within it remain. Examples are basalt and rhyolite, which cooled on the earth's surface and are very fine-grained and therefore have a finer texture. But the slower a rock cools, the larger the individual mineral grains within it can grow. The best example is granite, a very coarse-textured rock that cooled very slowly deep within the earth.
Wiki User
∙ 13y ago
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Was igneous rocks were classified by their their origin texture and shape?
No, igneous rocks are not classified by their shape. They are primarily classified based on their origin (either intrusive or extrusive) and their texture (coarse-grained, fine-grained, glassy, etc.). Shape or form is not a major factor in the classification of igneous rocks.
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Was igneous rocks were classified by their their origin texture and shape?
No, igneous rocks are not classified by their shape. They are primarily classified based on their origin (either intrusive or extrusive) and their texture (coarse-grained, fine-grained, glassy, etc.). Shape or form is not a major factor in the classification of igneous rocks.
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What is the most important factor affecting the texture of igneous rock?
The rate at which the lava or magma cools affects the grain size, or texture, of the rock. The faster a rock cools, the smaller the individual mineral grains within it remain. Examples are basalt and rhyolite, which cooled on the earth's surface and are very fine-grained and therefore have a finer texture. But the slower a rock cools, the larger the individual mineral grains within it can grow. The best example is granite, a very coarse-textured rock that cooled very slowly deep within the earth.
How is the size of mineral crystals in igneous rock related to the rate at which they cool?
When igneous rocks cool quickly, they have small crystals and have a texture that may be described as aphanitic. When igneous rocks cool slowly, they have much larger crystals and have a texture that may be described as phaneritic or pegmatitic.
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