ureilite Comparison Table

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

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ureilite comparison table

Subject has sediment mechanism has shock texture has weather resistance has reference has degree of shock metamorphism has shock stage is an instance of has fragmentation probability has pyroxene shock metamorphism has metamorphism mechanism has shock diagnostic mineral has olivine composition has olivine shock metamorphism has weather has relative abundance has texture has value has pronunciation has matrix composition has composition is a kind of has find date has original texture has origin has ablative mass loss has shock pressure has lithic clast composition has plagioclase has pigeonite composition has definition has intergranular boundary has gain size

bi-modal ureilite low high because it is more friable than iron meteorite 7.1 % of meteorite falls bi-modal with extremely large 15mm crystals of low-Ca pyroxene poikilitically enclosing domains with ureilite texture carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume silicates (with very few exceptions) ureilite asteroid high because it is more friable than iron meteorite

calcic ureilite low high because it is more friable than iron meteorite 7.1 % of meteorite falls carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume high calcium, high FeO, low ¹⁶O, high ¹⁷O and ¹⁸O ureilite asteroid high because it is more friable than iron meteorite

intermediate FeO ureilite low high because it is more friable than iron meteorite 7.1 % of meteorite falls carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume intermediate FeO, variable ¹⁶O, ¹⁷O, and ¹⁸O ureilite asteroid high because it is more friable than iron meteorite

LEW 87165 which depends on its composition AMN 12-1, AMN 13-1 meteorite find during meteor phase which depends on composition Fo% 85 can be severe due to long exposure time to environmental corrosion agents lower because the fall was not witnessed carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume often minerals not found on Earth when the meteorite was found meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal directly proportional to initial velocity Fs% 13 ?

low shock ureilite silicates show minor fracturing, undulatory extinction and kink bands primarily in olivine which depends on its composition low S2-S3 during meteor phase which depends on composition shock metamorphism small euhedral graphite crystals can sometimes be distinguished fracturing, undulatory extinction and kink bands carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume often minerals not found on Earth S3 shock stage meteorite asteroid directly proportional to initial velocity less than 20 GPa

magnesian ureilite low high because it is more friable than iron meteorite 7.1 % of meteorite falls carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume low FeO, high ¹⁶O, low ¹⁷O and ¹⁸O ureilite asteroid high because it is more friable than iron meteorite

medium shock ureilite greater extent of fracturing, undulatory extinction, and kink banding which depends on its composition medium S4-S6 during meteor phase which depends on composition may be cloudy due to glassy inclusions shock metamorphism diamonds and/or lonsdaleite sub-grain boundaries may be prominent carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume often minerals not found on Earth S6 shock stage meteorite asteroid directly proportional to initial velocity from 20 GPa to 100 GPa

monomict ureilite low high because it is more friable than iron meteorite 7.1 % of meteorite falls large, anhedral olivine and pyroxene grains carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume silicates (with very few exceptions) ureilite asteroid high because it is more friable than iron meteorite 0 % curved meeting in triple junctions 1 mm

mosaicized ureilite which depends on its composition shock melted shock melted during meteor phase which depends on composition mottled by melt glass shock metamorphism diamonds and/or lonsdaleite completely shattered or mosaicized mosaicized carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume often minerals not found on Earth shock melted meteorite visible via dark matrix outlining relict grain boundaries of large, elongate grains, and a common preferred orientation of grains within relict domains -has source: Berkley JL, Taylor GJ, Keil K. Harlow GE, Prinz M 1980, Geochim Cosmochim Acta 44, 1579 -has URL: http://adsabs.harvard.edu/cgi-bin/bib_query?1980GeCoA..44.1579B asteroid directly proportional to initial velocity 100 GPa or greater much less than 1 mm

polymict ureilite low high because it is more friable than iron meteorite 7.1 % of meteorite falls bre - chia smaller mineral fragments, carbon, suessite (Fe3Si), sulfides, minor chromite and minor apatite silicates (with very few exceptions) polymict breccia asteroid high because it is more friable than iron meteorite typical monomict ureilite material plus a variety of other lithic clasts common in clasts fragmental breccias containing lithic clasts of typical monomict ureilite material plus a variety of other lithic clasts

very low shock ureilite which depends on its composition unshocked S1 during meteor phase which depends on composition shock metamorphism no diamonds or lonsdaleite carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume often minerals not found on Earth S1 shock stage meteorite asteroid directly proportional to initial velocity less than 5 GPa

Next asteroidal achondrite: angrite Up: asteroidal achondrite, ultramafic rock Previous asteroidal achondrite: HED meteorite

Subject	has sediment mechanism	has shock texture	has weather resistance	has reference	has degree of shock metamorphism	has shock stage	is an instance of	has fragmentation probability	has pyroxene shock metamorphism	has metamorphism mechanism	has shock diagnostic mineral	has olivine composition	has olivine shock metamorphism	has weather	has relative abundance	has texture	has value	has pronunciation	has matrix composition	has composition	is a kind of	has find date	has original texture	has origin	has ablative mass loss	has shock pressure	has lithic clast composition	has plagioclase	has pigeonite composition	has definition	has intergranular boundary	has gain size
bi-modal ureilite			low					high because it is more friable than iron meteorite							7.1 % of meteorite falls	bi-modal with extremely large 15mm crystals of low-Ca pyroxene poikilitically enclosing domains with ureilite texture			carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	silicates (with very few exceptions)	ureilite			asteroid	high because it is more friable than iron meteorite
calcic ureilite			low					high because it is more friable than iron meteorite							7.1 % of meteorite falls				carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	high calcium, high FeO, low ¹⁶O, high ¹⁷O and ¹⁸O	ureilite			asteroid	high because it is more friable than iron meteorite
intermediate FeO ureilite			low					high because it is more friable than iron meteorite							7.1 % of meteorite falls				carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	intermediate FeO, variable ¹⁶O, ¹⁷O, and ¹⁸O	ureilite			asteroid	high because it is more friable than iron meteorite
LEW 87165			which depends on its composition	AMN 12-1, AMN 13-1			meteorite find	during meteor phase which depends on composition				Fo% 85		can be severe due to long exposure time to environmental corrosion agents			lower because the fall was not witnessed		carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	often minerals not found on Earth		when the meteorite was found		meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal	directly proportional to initial velocity				Fs% 13 ?
low shock ureilite		silicates show minor fracturing, undulatory extinction and kink bands primarily in olivine	which depends on its composition		low	S2-S3		during meteor phase which depends on composition		shock metamorphism	small euhedral graphite crystals can sometimes be distinguished		fracturing, undulatory extinction and kink bands						carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	often minerals not found on Earth	S3 shock stage meteorite			asteroid	directly proportional to initial velocity	less than 20 GPa
magnesian ureilite			low					high because it is more friable than iron meteorite							7.1 % of meteorite falls				carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	low FeO, high ¹⁶O, low ¹⁷O and ¹⁸O	ureilite			asteroid	high because it is more friable than iron meteorite
medium shock ureilite		greater extent of fracturing, undulatory extinction, and kink banding	which depends on its composition		medium	S4-S6		during meteor phase which depends on composition	may be cloudy due to glassy inclusions	shock metamorphism	diamonds and/or lonsdaleite		sub-grain boundaries may be prominent						carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	often minerals not found on Earth	S6 shock stage meteorite			asteroid	directly proportional to initial velocity	from 20 GPa to 100 GPa
monomict ureilite			low					high because it is more friable than iron meteorite							7.1 % of meteorite falls	large, anhedral olivine and pyroxene grains			carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	silicates (with very few exceptions)	ureilite			asteroid	high because it is more friable than iron meteorite			0 %			curved meeting in triple junctions	1 mm
mosaicized ureilite			which depends on its composition		shock melted	shock melted		during meteor phase which depends on composition	mottled by melt glass	shock metamorphism	diamonds and/or lonsdaleite		completely shattered or mosaicized			mosaicized			carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	often minerals not found on Earth	shock melted meteorite		visible via dark matrix outlining relict grain boundaries of large, elongate grains, and a common preferred orientation of grains within relict domains -has source: Berkley JL, Taylor GJ, Keil K. Harlow GE, Prinz M 1980, Geochim Cosmochim Acta 44, 1579 -has URL: http://adsabs.harvard.edu/cgi-bin/bib_query?1980GeCoA..44.1579B	asteroid	directly proportional to initial velocity	100 GPa or greater						much less than 1 mm
polymict ureilite			low					high because it is more friable than iron meteorite							7.1 % of meteorite falls			bre - chia	smaller mineral fragments, carbon, suessite (Fe3Si), sulfides, minor chromite and minor apatite	silicates (with very few exceptions)	polymict breccia			asteroid	high because it is more friable than iron meteorite		typical monomict ureilite material plus a variety of other lithic clasts	common in clasts		fragmental breccias containing lithic clasts of typical monomict ureilite material plus a variety of other lithic clasts
very low shock ureilite			which depends on its composition		unshocked	S1		during meteor phase which depends on composition		shock metamorphism	no diamonds or lonsdaleite								carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	often minerals not found on Earth	S1 shock stage meteorite			asteroid	directly proportional to initial velocity	less than 5 GPa