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rock > igneous rock > differentiated meteorite > differentiated achondrite > asteroidal achondrite

asteroidal achondrite comparison table

Subject	has weather resistance	has minerology	has fragmentation probability	has olivine grain characteristic	has likely origin	has solidification mechanism	has genesi	has letter designation	has relative abundance	has prototype	has oxidation state	has total mass of find	has matrix composition	has characteristic mineral	has composition	is a kind of	has property	has number of find	has origin	has ablative mass loss	has solidification timescale	be an acronym for	has petrology
angrite	low	Al-Ti-diopside, anorthite, calcic olivine	high because it is more friable than iron meteorite		crystallized melts, cumulates (?)			ACANOM	7.1 % of meteorite falls	Angra dos Reis meteorite		1606 kg		augite	silicates (with very few exceptions)	asteroidal achondrite		70	asteroid	high because it is more friable than iron meteorite			fine- to coarse-grained igneous
aubrite	which depends on its composition	enstatite, forsterite, sodic plagioclase, metal, numerous sulfides	during meteor phase which depends on composition		melted and crystallized residues from partial melting			AUB			highly reduced with very little FeO	1205 kg		enstatite	often minerals not found on Earth	highly reduced meteorite		9	asteroid	directly proportional to initial velocity			breccias of igneous lithologies
brachinite	low	olivine, augite, Fe-sulfide, some orthopyroxene and some sodic plagioclase	high because it is more friable than iron meteorite		metamorphosed chondrite, partial melting residue	cooling in deep underground chambers	fractional crystallization		7.1 % of meteorite falls	Brachina meteorite		1606 kg			olivine and some clinopyroxene	dunitic wehrlite	formed by separation of molten rock in a gravity field	70	asteroid	high because it is more friable than iron meteorite	very slow		medium- to coarse-grained equigranular
HED meteorite	low	orthopyroxene, olivine, chromite; pigeonite, calcic plagioclase, silica	high because it is more friable than iron meteorite		cumulates, crystallized melts, impact mixing				7.1 % of meteorite falls			1606 kg			silicates (with very few exceptions)	asteroidal achondrite		70	4 Vesta	high because it is more friable than iron meteorite		Howardite, Eucrite, Diogenite	coarse-grained orthopyroxenites, gabbros, fine- to coarse-grained basalts, brecciated
ureilite	low	olivine, pyroxene (some combination of pigeonite, orthopyroxene, augite)	high because it is more friable than iron meteorite	reduced rims contacting carbonaceous matrix material 0.1 mm FeO-free olivine and/or enstatite rims riddled with tiny inclusions of low-Ni metal	partial melting residue	cooling in deep underground chambers		AURE	7.1 % of meteorite falls			9 kg (out of date)	carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	olivine-pigeonite about 90% by volume	silicates (with very few exceptions)	ultramafic rock		6 (out of date)	asteroid	high because it is more friable than iron meteorite	very slow		coarse-grained granular

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