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pallasite
subject			fact

pallasite	is a kind of stony iron meteorite
	has composition metallic iron plus olivine; core/mantle boundary samples
	has letter designation PAL
	has olivine content 35 to 85 % by volume
	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
stony iron meteorite	has distinguishing feature mixture of iron-nickel alloy and non-metallic minerals
	has relative abundance 1.5 % of meteorite falls
metal-rich meteorite	has metal content higher than that of average solar system material
	has nickel content always greater than 4 %
differentiated meteorite	has origin planet or asteroid much larger than 100 km in diameter
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 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
	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
igneous rock	has solidification mechanism
	has solidification timescale
rock	has part mineral
	has texture
	has genesis

Kinds of pallasite :

• Eagle Station grouplet pallasite (3 kinds, 3 facts)
• main group pallasite (15 kinds, 7 facts)
• pyroxene grouplet pallasite (2 kinds, 2 facts)

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