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Re: Earth meteorites?

	Looking at my last post, I realized it was somewhat off the mark, 
and sort of muddled in ambiguity. I was tring to say that a fusion 
crusted Earth rock is unlikely, NOT impossible, just unlikely, and what 
we see are tektites, due to the force needed to liberate material from 
the planet Earth. 
	The physics of impact craters do not really relate impact 
velocity, to the amount of material ejected into space. I have found 
equations relating to ejecta blankets, and boulder piles around crater 
rims, but nothing in way of tektite/Earth meteorite formation. I will 
look harder, and keep all posted on what I find.
	We should not be disuaded by such lacking information, as the 
answer to the question is possibly, simple deduction. For material to be 
ejected into space, it must over come the gravitational field of the body 
it originated on. For Earth, this is 11.5 km/sec, a large number to say 
the least. To visualize this, think of the fuel, and power the Space 
Shuttle produces when it takes off, as it too has to reach the above 
stated speed.
	Lets look at Mars, and the Moon. Mars has an escape velocity of 
5km/sec, and the Moon has one of 2.3km/sec. If we look at their 
meteorites we see that Mars meteorites suffered an intense shock, 
indicated by the maskylinite found among the minerals. The Moon's 
meteorites have a less severe shocking, and shows only minor alteration.
	An impact would have to be very large and powerful to overcome 
the gravitation of Earth, as most all ejecta fall back in the same area. 
In order to liberate the material from Earth, the force and power would 
create such a heat that it would melt the rock in which the impact 
occured, leaving no unaltered rock to be ejected. 
	So the answer to Mr Baalke's question is this: Earth meteorites 
are possible, but improbable, and I have not found any information 
indicating any suspected Earth meteorites. I apologize for the long winded 
answer, and the ambiguities of the previous post. Before I end this 
post, I must say, that I am still looking into this, and may revise the 
above statements.

Frank Stroik
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