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rock > metamorphic rock > altered chondrite > shocked chondrite > S1 shock stage chondrite > Murchison

Murchison
subject			fact

Murchison	has image
	is an instance of CM chondrite
	is an instance of meteorite fall
	is an instance of S1 shock stage chondrite
	has name Murchison
	has fall date September 28, 1969 10:45 am
	has fall coordinates 36° 37' S., 145° 12' E.
	has fall location Murchison, Victoria, Australia
	have composition contain amino acids
	has image
CM chondrite	has prototype Mighei meteorite
	has chondrule abundance 20 % by volume
	has matrix abundance 70 % by volume
	has refractory inclusion abundance 5 % by volume
	has metal abundance 0.1 % by volume
	has chondrule mean diameter 0.3 millimeters
	has chondrule glass type rare
	has tenacity friable
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
S1 shock stage chondrite	has olivine shock metamorphism sharp optical extinction, irregular fractures
	has plagioclase shock metamorphism sharp optical extinction, irregular fractures
	has orthopyroxene shock metamorphism sharp optical extinction, irregular fractures
carbonaceous chondrite	has relative abundance 8 % of meteorite falls
	has total mass of finds 2577 kg
	has number of finds 36
	has distinguishing feature elemental carbon
	has abundance rare relative to other chondrite types
type 2 chondrite	has petrologic type 2
	has degree of aqueous alteration moderate
	has olivine and low Ca pyroxene homogeneity greater than 5 % deviations
	has structural state of low Ca pyroxene predominantly monoclinic
	has part feldspar minor primary grains only
	has part maximum bulk Ni in metal less than 20 % by weight; taenite minor or absent
	has part sulfide Ni content greater than 0.5 % by weight
	has part matrix mostly fine, opaque
	has part chondrule chondrules very sharply defined
	has part carbon 0.8 to 2.6 % by weight
	has part water 2 to 16 % by weight
meteorite	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 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
shocked chondrite	is independent of the nature and degree of thermal metamorphism or aqueous alteration
	can be shocked before, during or after other types of metamorphism
	has shock pressure the equilibration peak shock pressure in GPa (gigapascals) for ordinary chondrites only
	has shock diagnostic mineral olivine and plagioclase for ordinary chondrite
	has shock diagnostic mineral olivine for carbonaceous chondrite
	has shock diagnostic mineral orthopyroxene for enstatite chondrite
S1 shock stage meteorite	has shock stage S1
	has shock pressure less than 5 GPa
	has degree of shock metamorphism unshocked
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 %
water altered chondrite	has metamorphism mechanism aqueous altermation
rock	has part mineral
	has texture
	has genesis
altered chondrite	has degree of secondary processing providing insight into geological evolution of parent asteroid
shocked meteorite	has metamorphism mechanism shock metamorphism
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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