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rock > igneous rock > volcanic rock > basalt

basalt
subject			fact

basalt	is a kind of volcanic rock
volcanic rock	has solidification mechanism extrusion onto the surface of the planet or asteroid via a volcanic eruption
	has solidification timescale very rapid
igneous rock	has composition silicates (with very few exceptions)
rock	has part mineral
	has texture
	has genesis

Kinds of basalt :

• basalt shergottite (2 kinds, 3 facts)
• eucrite (3 kinds, 6 facts)