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Grain refers to particle or crystal size in rock.
Grain shape.
The cooling rate of the rock.
The name of a rock is usually derived from the sediment grain size.
Granite is considered a coarse grained rock.
It depend what rock it is but extrusive rocks generally non-crystalline or have a grain size of less than 1 mm
Fast cooling lava or magma creates an aphanitic or small crystal (grain) textured igneous rock.
Grain size increases in the process of recrystallization.
clay
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It depends on if it is intrusive or extrusive. If it is an intrusive rock, it is formed when magma hardens under the earth and has a larger grain size. If it is an extrusive rock, it is formed when lava hardens on the earth's surface and has a smaller grain size.
Grain refers to particle or crystal size in rock.
1.Grain Size 2.Grain Shape 3.Grain Pattern
Grain size and arrangement.
Grain shape.
The cooling rate of the rock.
the size of a sand grain or smaller