Meteorites   View all facts   Glossary   Help

rock > igneous rock > differentiated meteorite > metal-rich meteorite > stony iron meteorite > pallasite > pyroxene grouplet pallasite > Y-8451

Y-8451
subject			fact

Y-8451	is an instance of pyroxene grouplet pallasite
	is an instance of Antarctic meteorite
	has olivine content 55 to 63 % by volume
	has metal content 30 to 43 % by volume
	has pyroxene content 1 to 3 % by volume
	has troilite content 1 % by volume
	has olivine SiO2 content 40.2 % by weight
	has olivine FeO content 10.2 % by weight
	has olivine MgO content 49.1 % by weight
	has olivine MnO content 0.37 % by weight
	has olivine Cr2O3 content 0.08 % by weight
	has olivine CaO content 0.05 % by weight
	has olivine Fe/Mn ratio 27
	has olivine magnesium content 89.6 mg# or 100 * Mg/(Mg + Fe)
pyroxene grouplet pallasite	has distinguishing feature large mm sized pyroxene crystals poikilitically containing small olivine grains
Antarctic meteorite	has fall location Antarctica
	has name 3 or 4 letter contracted from find location then last two digits of year then id number
	has find date recovery year is first 2 numbers in name
	has fall location indicated by letters in the beginning of name
	has identification date
pallasite	has composition metallic iron plus olivine; core/mantle boundary samples
	has letter designation PAL
	has phosphate content 1 % or less by volume
	has chromite content 1 % or less by volume
	has olivine grain shape from angular fragments to rounded
	has olivine grain size typically one centimeter
	has olivine crystal distribution from homogeneous to heterogeneous
	has formation cooling rate 2.5 to 4 degrees C per million years
	parent body radius 78 to 97 kilometers
	has total mass of finds 7207 kg
	has number of finds 33
meteorite	has fall date recorded by eyewitness or inferred from dating methods
	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 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
rock	has part mineral
	has texture
	has genesis
metal-rich meteorite	has nickel content always greater than 4 %
igneous rock	has solidification mechanism
	has solidification timescale

Next Antarctic meteorite: ALH 84001    Up: Antarctic meteorite, pyroxene grouplet pallasite    Previous Antarctic meteorite: Y 793605