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rock > igneous rock > differentiated meteorite > differentiated achondrite > asteroidal achondrite > ureilite > polymict ureilite > EET 87720

EET 87720
subject			fact

EET 87720	is an instance of polymict ureilite
	is an instance of meteorite find
	has olivine composition Fo% 79-87
	has pigeonite composition Wo% 8.0 En% 83
	has augite composition Wo% 35 En% 52
	has reference Warren and Kallemeyn (1991), AMN 12-3, AMN 13-1
	is an instance of polymict ureilite
	is an instance of Antarctic meteorite
	has name EET 87720
	has fall location Elephant Moraine, Antarctica
	has find date 1987
polymict ureilite	has lithic clast composition typical monomict ureilite material plus a variety of other lithic clasts
	has matrix composition smaller mineral fragments, carbon, suessite (Fe3Si), sulfides, minor chromite and minor apatite
	has plagioclase common in clasts
meteorite find	has value lower because the fall was not witnessed
	has weathering can be severe due to long exposure time to environmental corrosion agents
Antarctic meteorite	has identification date
ureilite	has letter designation AURE
	has characteristic mineral olivine-pigeonite about 90% by volume
	has total mass of finds 9 kg (out of date)
	has number of finds 6 (out of date)
	has minerology olivine, pyroxene (some combination of pigeonite, orthopyroxene, augite)
	has petrology coarse-grained granular
	has likely origin partial melting residue
	has olivine grain characteristic reduced rims contacting carbonaceous matrix material 0.1 mm FeO-free olivine and/or enstatite rims riddled with tiny inclusions of low-Ni metal
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
breccia	has pronunciation bre - chia
rock	has part mineral
	has texture
	has genesis
plutonic rock	has solidification mechanism cooling in deep underground chambers
	has solidification timescale very slow
sedimentary rock	has sediment mechanism
achondrite	has distinguishing feature no chondrules

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