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

polymict ureilite
subject			fact

polymict ureilite	is a kind of ureilite
	is a kind of polymict breccia
	has definition fragmental breccias containing lithic clasts of typical monomict ureilite material plus a variety of other lithic clasts
	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
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	has total mass of finds 9 kg (out of date)
	has number of finds 6 (out of date)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
asteroidal achondrite	has origin asteroid
breccia	has pronunciation bre - chia
plutonic rock	has solidification mechanism cooling in deep underground chambers
	has solidification timescale very slow
sedimentary rock	has sediment mechanism
achondrite	has relative abundance 7.1 % of meteorite falls
	has distinguishing feature no chondrules
igneous rock	has composition silicates (with very few exceptions)
rock	has part mineral
	has texture
	has genesis
meteorite	has fall date recorded by eyewitness or inferred from dating methods
	has fall location strewn fields, elongated footprints which depends on impact angle, airbursts, and impact velocity
	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 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
	has name based on the locale, region, or nearby town in which the fall occurred
	often produce power outages and failures in electrical equipment due to EMP (electromagnetic pulse)
	can be associated with crater
	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
stony meteorite	has weather resistance low
	has fragmentation probability high because it is more friable than iron meteorite
	has ablative mass loss high because it is more friable than iron meteorite

Kinds of polymict ureilite :

• DaG 319 (10 facts)
• EET 83309 (11 facts)
• EET 87720 (11 facts)
• Nilpena (8 facts)
• North Haig (9 facts)

Up: polymict breccia, ureilite