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meteorite characteristic > meteorite fusion crust > primary fusion crust

primary fusion crust
subject			fact

primary fusion crust	is a part of meteorite
	is a kind of meteorite fusion crust
	has definition thin layer of ablated material that forms before a potential meteoroid break up from the beginning of incandescent flight until dark flight
	has thickness greater than secondary fusion crust
meteorite fusion crust	has extent directly proportional to the initial velocity of a meteoroid
	has color black except for rare iron-poor meteorites
	has texture
	has weather resistance
	has composition
	is different from interior of meteorite