grain size, igneous rocks
grain size, igneous rocks Arbitrarily defined limits for the sizes of crystals within an igneous rock. Commonly accepted grain-size ranges are:
For sedimentary rocks, see PARTICLE SIZE.
Very coarse | >3 cm |
Coarse | 5 mm to 3 cm |
Medium | 1–5 mm |
Fine | <1 mm |
Glassy | no grains present |
For sedimentary rocks, see PARTICLE SIZE.
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grain size, igneous rocks