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Allende
subject			fact

Allende	has image
	is an instance of oxidized-Allende subgroup CV chondrite
	is an instance of meteorite fall
	has name Allende
	has fall date February 8, 1969 1:05 am
	has fall coordinates 26° 58' N., 105° 19' W.
	has fall location village of Pueblito de Allende, Chihuahua State, Mexico
	has petrologic subtype 3.2
	has image
	has fall map
	has original mass several tons
	have composition iron rich olivine matrix, 24 % iron, rare flecks of iron-nickel
oxidized-Allende subgroup CV chondrite	has synonym CV3OxA chondrite
	has prototype Allende meteorite
meteorite fall	has value higher because the fall was witnessed
	has fall description what witnesses saw or what was recorded by instruments
	has weathering negligible due to quick recovery of meteorite before corrosion begins
CV chondrite	has degree of aqueous alteration weak
	has composition iron-rich olivine, calcium aluminum inclusions
	has chondrule abundance 45 % by volume
	has matrix abundance 40 % by volume
	has refractory inclusion abundance 10 % by volume
	has metal abundance 0 to 5 % by volume
	has chondrule mean diameter 1.0 millimeters
meteorite	can have crater image
	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
carbonaceous chondrite	has distinguishing feature elemental carbon
	has abundance rare relative to other chondrite types
type 3 chondrite	has petrologic type 3
	has degree of thermal metamorphism none
	has olivine and low Ca pyroxene homogeneity greater than 5 % deviations
	has structural state of low Ca pyroxene predominantly monoclinic
	has chondrule glass type clear, isotropic, variable abundance
	has part feldspar minor primary grains only
	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 clastic and minor opaque
	has part chondrule chondrules very sharply defined
	has part carbon 0.2 to 1 % by weight
	has part water 0.3 to 3 % by weight
rock	has part mineral
	has texture
	has genesis
chondrite	has petrologic type range which depends on degree of aqueous alteration and thermal metamorphism
	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 %
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
conglomerate	has sediment mechanism agglomeration of particles, many of which record individual, diverse histories

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