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Vaca Muerta Etch Pattern



Bob Verish wrote:

I couldn't resist the urge to etch the mostly metallic surface.  Lo and
behold,
what had formed was a microscopic etch (Widmanstatten?) pattern!


Hello Bob,

I suppose I couldn't have resisted either. An interesting posting that
does make sense (much more sense than discussing pointy heads and the
absence or presence of humor).

It's late here in Germany (about 23:58 p.m.) so I only glanced at my
database to see if there is any other MES with a Widmannstätten pattern.
You will know that they are common in a PAL like BRENHAM but what about
mesosiderites?
I found PINNAROO (39.4 kg) whose metal shows a Widmanstätten structure,
too. The analysis of the PINNAROO metal yields a value of 9.66 % Ni,
which is a lot of nickel for a mesosiderite (normal value: minimum 6%
and maximum 10% Ni - exception: Chaunskij 14.37 % Ni => ungrouped iron;
the metal displays a mesosiderite structure; maybe a highly
metamorphosed mesosiderite).

Regards, Bernd


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