[meteorite-list] Henbury: deformed etch pattern

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 10:02:29 2004
Message-ID: <3C939B9D.59E3BF0F_at_lehrer1.rz.uni-karlsruhe.de>

Starbits_at_aol.com wrote:

> This is for those of you who are interested in unusual
> etch patterns. The following URL is to a page with
> several pictures of some henbury slices I just got back
> from etching. Part of the pattern is normal and part is
> smeared, I would guess from an impact. Enjoy the
> photos.
>
> http://www.star-bits.com/henburyetch.htm

Hello Eric and List,

Thank you for sharing these beautifully deformed Henburys
with us! Here is what O.R. Norton says about them:

"Most of the meteorites are fragments torn from the main mass on impact.
Many are thin, with bent and ragged edges attesting to the great forces
to which they were subjected. Polished and etched specimens show
Widmanstätten patterns deformed into curved plates by mechanical
stresses. Some meteorites show evidence of heating to over 800° F,
which destroyed their Widmanstätten patterns, especially around the
edges. These were probably ejected from the two largest craters when
their explosive formation caused the greatest heating."


Best regs,

Bernd
Received on Sat 16 Mar 2002 02:23:09 PM PST