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rock > metamorphic rock > altered chondrite > thermally altered chondrite > type 4 chondrite > E4 chondrite

E4 chondrite
subject			fact

E4 chondrite	is a kind of enstatite chondrite
	is a kind of type 4 chondrite
	has total mass of finds 143 kg
	has number of finds 5
enstatite chondrite	has synonym E chondrite
	has oxidized iron content zero
type 4 chondrite	has petrologic type 4
	has degree of thermal metamorphism weak
	has olivine and low Ca pyroxene homogeneity less than 5 % mean deviations
	has structural state of low Ca pyroxene greater than 20 % monoclinic
	has chondrule glass type devitrified, absent
	has part feldspar secondary, grains than 2 microns
	has part maximum bulk Ni in metal greater than 20 % by weight, kamacite and taenite in exsolution relationship
	has part sulfide Ni content less than 0.5 % by weight
	has part matrix transparent, recrystallized, small crystals
	has part chondrule chondrules well defined
	has part carbon less than 0.2 % by weight
	has part water less than 1.5 % by weight
highly reduced meteorite	has oxidation state highly reduced with very little FeO
thermally altered chondrite	has metamorphism mechanism thermal metamorphism
	has alteration temperature range the range over at which the alteration took place
chondrite	has petrologic type range which depends on degree of aqueous alteration and thermal metamorphism
	has relative abundance 85.7 % of meteorite falls
	has homogeneity of olivine and low Ca pyroxene definition goes here
	has part metal maximum bulk in weight %
	has part mean Ni content of sulfides in weight %
	has chondrule abundance in volume %
	has matrix abundance in volume %
	has refractory inclusion abundance in volume %
	has metal abundance in volume %
	has chondrule mean diameter millimeters
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 composition often minerals not found on Earth
	has relative abundance
	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
	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
altered chondrite	has degree of secondary processing providing insight into geological evolution of parent asteroid
undifferentiated meteorite	has peak temperature less than 950 degree Celsius during its entire history since solidification
	has parent body asteroid smaller than 100 km in diameter
	has age oldest and most primitive rock in solar system
rock	has part mineral
	has texture
	has genesis
conglomerate	has sediment mechanism agglomeration of particles, many of which record individual, diverse histories

Kinds of E4 chondrite :

• EH4 chondrite (2 kinds, 2 facts)
• EL4 chondrite (2 kinds, 2 facts)

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