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rock > aphanitic rock > fine-grained rock

fine-grained rock comparison table

Subject	is a kind of	has grain size	has definition
aphanitic rock	rock	too small to see with unaided eye or low power lens	a rock with grains too small to see or identify with either the unaided eye or a low power lens
fine-grained rock	aphanitic rock	0.1 to 0.3 mm

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