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DaG 604
subject			fact

DaG 604	has image
	is an instance of Dar al Gani meteorite
	is an instance of S3 shock stage chondrite
	is an instance of H4 chondrite
	has mass 0.180 kg
	has find date 1998
	has weathering stage W2
	has olivine composition Fa% 18.1
	has pyroxene composition Fs% 16.4
	classified by A. Sexton, Open University, UK. Meteoritical Bulletin No 83
	has number of fragments 1
	has fall coordinates 26° 58.74' N. 16° 18.65' E.
Dar al Gani meteorite	has fall location Dar al Gani plateau, Libyan Sahara Desert
	has acronym DaG
S3 shock stage chondrite	has olivine shock metamorphism planar fractures, undulatory extinction, irregular fractures
	has plagioclase shock metamorphism undulatory extinction
	has orthopyroxene shock metamorphism clinoenstatite lamellae on (100), undulatory extinction, planar fractures, irregular fractures
H4 chondrite	has total mass of finds 1251 kg
	has number of finds 37
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
S3 shock stage meteorite	has shock stage S3
	has shock pressure 15 to 20 GPa
	has degree of shock metamorphism weakly shocked
H chondrite	has synonym bronzite chondrite
	has chondrule abundance 60 to 80 % by volume
	has matrix abundance 10 to 15 % by volume
	has refractory inclusion abundance 0.1 to 1 % by volume
	has metal abundance 10 % by volume
	has chondrule mean diameter 0.3 millimeters
	has total iron content high
	has metal iron content 12 to 21 %
	has iron metal and iron sulfide 75 % of total iron
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
meteorite	has fall date recorded by eyewitness or inferred from dating methods
	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
meteorite find	has value lower because the fall was not witnessed
	has weathering can be severe due to long exposure time to environmental corrosion agents
altered chondrite	has degree of secondary processing providing insight into geological evolution of parent asteroid
shocked meteorite	has metamorphism mechanism shock metamorphism
ordinary chondrite	has abundance most common chondrite observed from falls
thermally altered chondrite	has metamorphism mechanism thermal metamorphism
	has alteration temperature range the range over at which the alteration took place
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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