Categories of rock grain size
Table
Categories of rock grain size
terms in common use general grain size
igneous rocks
in general pegmatites
fine-grained \\<1 mm \\<1 in.
medium-grained 1–5 mm 1 in.–4 in.
coarse-grained 5 mm–2 cm 4 in.–12 in.
very coarse-grained \\>2 cm \\>12 in.
See as table: