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rock > gravitationally separated rock > fractional crystallized rock > plutonic cumulate > orthopyroxenite > ALH 84001 meteorite > ALH 84001

ALH 84001
subject			fact

ALH 84001	is an instance of ALH 84001 meteorite
	is an instance of Antarctic meteorite
	has name ALH 84001
	has fall location Allan Hills, Antarctica
	has find date 1994
	has identification date 1993
	has mass 1.90 kg
	has curatorial location MWG (JSC), SI
	has SiO2 content 52.8 % by mass
	has TiO2 content 0.20 % by mass
	has Al2O3 content 1.23 % by mass
	has Cr2O3 content 1.22 % by mass
	has FeO content 17.4 % by mass
	has MnO content 0.45 % by mass
	has MgO content 24.6 % by mass
	has CaO content 1.78 % by mass
	has Na2O content 0.14 % by mass
	has K2O content 0.02 % by mass
	has P2O5 content 0.01 % by mass
	has sulfur content 0.01 % by mass
ALH 84001 meteorite	has prototype ALH 84001 meteorite
martian meteorite	has origin Mars
orthopyroxenite	has composition orthopyroxene
meteorite	has fall date recorded by eyewitness or inferred from dating methods
	has fall coordinates in degrees, minutes and seconds of lattitude and longitude
	has fall map which appears as an elongated footprint which depends on impact angle, airbursts, and impact velocity
	can have crater image
	has original mass which can over an order of magnitude greater than total mass of fragment(s) collected at the impact site
	has composition often minerals not found on Earth
	has relative abundance
	has total mass of finds 485755 kg
	has number of finds 1691
	has impact velocity when it hits the ground which is smaller than its velocity before it enters the atmosphere
	has impact angle
	has weather resistance which depends on its composition
	has monetary value large if the fall was witnessed
	often produce power outages and failures in electrical equipment due to EMP (electromagnetic pulse)
	can be associated with crater
	has origin meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal
	vaporizes completely if size is between 3 micrometers and 3 millimeters
	can survive fall if size is larger than 3 mm and velocity is less than 24 km per second
	can survive fall if it fragments because smaller pieces with less mass are more easily slowed by the atmosphere
	has ablative mass loss depending on composition, more friable stony meteoroids loses more mass than iron meteoroid
	has ablative mass loss directly proportional to initial velocity
	can shatter during impact phase
	can fragment during meteor phase
	has fragmentation probability during meteor phase which depends on composition
rock	has part mineral
	has texture
	has genesis
achondrite	has distinguishing feature no chondrules
plutonic rock	has solidification mechanism cooling in deep underground chambers
	has solidification timescale very slow
gravitationally separated rock	has property formed by separation of molten rock in a gravity field

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