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rock > igneous rock > melanocratic rock

melanocratic rock
subject			fact

melanocratic rock	is a kind of igneous rock
	has definition dark-colored rock with color index between 50 and 89
	has shade dark
	has color index 50 to 89
igneous rock	has composition silicates (with very few exceptions)
	has solidification mechanism
	has solidification timescale
rock	has part mineral
	has texture
	has genesis