LEW 88774 Comparison Table

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rock > igneous rock > differentiated meteorite > differentiated achondrite > asteroidal achondrite > ureilite > bi-modal ureilite > LEW 88774

Next bi-modal ureilite: META 78008 Up: bi-modal ureilite, medium shock ureilite, meteorite find Previous bi-modal ureilite: HaH 064

LEW 88774 comparison table

Subject has shock texture has weather resistance has reference has minerology has degree of shock metamorphism has shock stage is an instance of has distinguishing feature has orthopyroxene composition has fragmentation probability has olivine grain characteristic has metamorphism mechanism has pyroxene shock metamorphism has likely origin has solidification mechanism has shock diagnostic mineral has olivine composition has olivine shock metamorphism has weather has letter designation has relative abundance has texture has value has total mass of find has matrix composition has characteristic mineral has composition is a kind of has find date has augite composition has number of find has origin has minor mineral has ablative mass loss has shock pressure has solidification timescale has definition has pyroxene content has petrology

bi-modal ureilite low olivine, pyroxene (some combination of pigeonite, orthopyroxene, augite) no chondrules 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 bi-modal with extremely large 15mm crystals of low-Ca pyroxene poikilitically enclosing domains with ureilite texture 9 kg (out of date) carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume olivine-pigeonite about 90% by volume silicates (with very few exceptions) ureilite 6 (out of date) asteroid high because it is more friable than iron meteorite very slow coarse-grained granular

medium shock ureilite greater extent of fracturing, undulatory extinction, and kink banding which depends on its composition olivine, pyroxene (some combination of pigeonite, orthopyroxene, augite) medium S4-S6 no chondrules during meteor phase which depends on composition reduced rims contacting carbonaceous matrix material 0.1 mm FeO-free olivine and/or enstatite rims riddled with tiny inclusions of low-Ni metal shock metamorphism may be cloudy due to glassy inclusions partial melting residue cooling in deep underground chambers diamonds and/or lonsdaleite sub-grain boundaries may be prominent AURE 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 often minerals not found on Earth S6 shock stage meteorite 6 (out of date) asteroid directly proportional to initial velocity from 20 GPa to 100 GPa very slow coarse-grained granular

meteorite find which depends on its composition during meteor phase which depends on composition can be severe due to long exposure time to environmental corrosion agents lower because the fall was not witnessed 485755 kg often minerals not found on Earth meteorite when the meteorite was found 1691 meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal directly proportional to initial velocity a meteorite whose fall was not witnessed

LEW 88774 greater extent of fracturing, undulatory extinction, and kink banding which depends on its composition Warren and Kallemeyn (1994), Prinz et. al (1994) olivine, pyroxene (some combination of pigeonite, orthopyroxene, augite) medium S4-S6 meteorite find no chondrules Wo% 4.2 En% 75 during meteor phase which depends on composition reduced rims contacting carbonaceous matrix material 0.1 mm FeO-free olivine and/or enstatite rims riddled with tiny inclusions of low-Ni metal shock metamorphism may be cloudy due to glassy inclusions partial melting residue cooling in deep underground chambers diamonds and/or lonsdaleite Fo% 75 sub-grain boundaries may be prominent can be severe due to long exposure time to environmental corrosion agents AURE bi-modal with extremely large 15mm crystals of low-Ca pyroxene poikilitically enclosing domains with ureilite texture lower because the fall was not witnessed 485755 kg carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume olivine-pigeonite about 90% by volume often minerals not found on Earth when the meteorite was found Wo% 33 En% 53 1691 meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal 6% chromite directly proportional to initial velocity from 20 GPa to 100 GPa very slow 0.83-0.87 in modal pyroxene/(pryroxene+olivine) coarse-grained granular

Next bi-modal ureilite: META 78008 Up: bi-modal ureilite, medium shock ureilite, meteorite find Previous bi-modal ureilite: HaH 064

Subject	has shock texture	has weather resistance	has reference	has minerology	has degree of shock metamorphism	has shock stage	is an instance of	has distinguishing feature	has orthopyroxene composition	has fragmentation probability	has olivine grain characteristic	has metamorphism mechanism	has pyroxene shock metamorphism	has likely origin	has solidification mechanism	has shock diagnostic mineral	has olivine composition	has olivine shock metamorphism	has weather	has letter designation	has relative abundance	has texture	has value	has total mass of find	has matrix composition	has characteristic mineral	has composition	is a kind of	has find date	has augite composition	has number of find	has origin	has minor mineral	has ablative mass loss	has shock pressure	has solidification timescale	has definition	has pyroxene content	has petrology
bi-modal ureilite		low		olivine, pyroxene (some combination of pigeonite, orthopyroxene, augite)				no chondrules		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	bi-modal with extremely large 15mm crystals of low-Ca pyroxene poikilitically enclosing domains with ureilite texture		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)	ureilite			6 (out of date)	asteroid		high because it is more friable than iron meteorite		very slow			coarse-grained granular
medium shock ureilite	greater extent of fracturing, undulatory extinction, and kink banding	which depends on its composition		olivine, pyroxene (some combination of pigeonite, orthopyroxene, augite)	medium	S4-S6		no chondrules		during meteor phase which depends on composition	reduced rims contacting carbonaceous matrix material 0.1 mm FeO-free olivine and/or enstatite rims riddled with tiny inclusions of low-Ni metal	shock metamorphism	may be cloudy due to glassy inclusions	partial melting residue	cooling in deep underground chambers	diamonds and/or lonsdaleite		sub-grain boundaries may be prominent		AURE				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	often minerals not found on Earth	S6 shock stage meteorite			6 (out of date)	asteroid		directly proportional to initial velocity	from 20 GPa to 100 GPa	very slow			coarse-grained granular
meteorite find		which depends on its composition								during meteor phase which depends on composition									can be severe due to long exposure time to environmental corrosion agents				lower because the fall was not witnessed	485755 kg			often minerals not found on Earth	meteorite	when the meteorite was found		1691	meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal		directly proportional to initial velocity			a meteorite whose fall was not witnessed
LEW 88774	greater extent of fracturing, undulatory extinction, and kink banding	which depends on its composition	Warren and Kallemeyn (1994), Prinz et. al (1994)	olivine, pyroxene (some combination of pigeonite, orthopyroxene, augite)	medium	S4-S6	meteorite find	no chondrules	Wo% 4.2 En% 75	during meteor phase which depends on composition	reduced rims contacting carbonaceous matrix material 0.1 mm FeO-free olivine and/or enstatite rims riddled with tiny inclusions of low-Ni metal	shock metamorphism	may be cloudy due to glassy inclusions	partial melting residue	cooling in deep underground chambers	diamonds and/or lonsdaleite	Fo% 75	sub-grain boundaries may be prominent	can be severe due to long exposure time to environmental corrosion agents	AURE		bi-modal with extremely large 15mm crystals of low-Ca pyroxene poikilitically enclosing domains with ureilite texture	lower because the fall was not witnessed	485755 kg	carbon, metal, sulfides small silicate grains along grain boundaries less than 10% by volume	olivine-pigeonite about 90% by volume	often minerals not found on Earth		when the meteorite was found	Wo% 33 En% 53	1691	meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal	6% chromite	directly proportional to initial velocity	from 20 GPa to 100 GPa	very slow		0.83-0.87 in modal pyroxene/(pryroxene+olivine)	coarse-grained granular