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volcanic rock comparison table

Subject	has texture	has grain size	has crystalinity	has composition	has clast size	has property	is a kind of
agglomerate				silicates (with very few exceptions)	64 mm or larger in diameter		volcanic rock
basalt				silicates (with very few exceptions)			volcanic rock
depleted basalt				depleted by gravitational separation		formed by separation of molten rock in a gravity field	gravitationally separated rock
lava				silicates (with very few exceptions)			volcanic rock
obsidian	glass	too small to see with unaided eye or low power lens	0 %	silicates (with very few exceptions)			aphanitic rock

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