Hello Bernd, Eric, and List, While the attached is not a Henbury deformation, it IS an unusual etch pattern present in a Canyon Diablo Rim (defined as being found in the rim of Meteor Crater) specimen. Contrast the nearly featureless RIM etch pattern with that of an etched "plains" Canyon Diablo specimen. The Rim specimen was subjected to great heat from the impact event which essentially erased the Widmanstatten lines.
Warmest Regards, Greg Redfern IMCA #5781 www.meteoritecollectors.org -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Bernd Pauli HD Sent: Saturday, March 16, 2002 2:23 PM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: [meteorite-list] Henbury: deformed etch pattern [EMAIL PROTECTED] 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 ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
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