[meteorite-list] They lack a fusion crust!?

From: Robert Verish <bolidechaser_at_meteoritecentral.com>
Date: Thu Apr 22 09:41:13 2004
Message-ID: <20010228230455.26000.qmail_at_web10414.mail.yahoo.com>

Hello List,

Here is a quote from some writer for Sky & Telescope:

"Dhofar 025 and 026 are brownish-gray amalgams of
fused rock chips blasted out of the lunar highlands
long ago. Weighing 751 and 148 grams, respectively,
the two were found 20 km apart in early March.
Although completely
different in texture and composition, they lack fusion
crusts and were found close together, so a single
precursor can't be ruled out."

My question is, Why does it lack a fusion crust?

>From the images that I have seen, both of these stones
clearly show evidence of ablation. If you suggest
that these are ventifacts, how do you explain a
uniform sand-blasting occurring over the entire
surface of these stones?

I have read that there were experiments which showed
that certain rock-types would not permit a fusion
crust to develop on their surface. Is this an example
of a fusion crust that wouldn't stick to the stones
surface?

If you suggest devitrification or "rind-development",
keep in mind that both of these stones have a very low
weathering grade. (By the way, Dhofar 081 does have a
fusion crust.)

Sure would like to hear from somebody that knows about
these kinds of things.
Bob V.



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Received on Wed 28 Feb 2001 06:04:55 PM PST