[meteorite-list] What's with these weird Campos?

From: Yinan Wang <veomega_at_meteoritecentral.com>
Date: Wed, 19 Jan 2011 21:23:21 -0600
Message-ID: <AANLkTimJK_WESi9m9mxQQ+_rRe-mxD_H2kjVRnDCr_oL_at_mail.gmail.com>

They're actually pretty stable, I've had some in a drawer for 2 years
and they're still shiny metallic.

If you'd like them to tarnish you can leave them outside for a few months.

-YvW

On Wed, Jan 19, 2011 at 9:18 PM, Bob King <nightsky55 at gmail.com> wrote:
> Thanks everyone for all your replies. OK, so they appear to be blown
> up Campos. If true, they must have looked a lot more like shrapnel
> with sharp edges. It makes sense then, as Bob C. reported, that
> they're tumbled. If water's used in the tumbling process, I'm guessing
> these things will rust up quickly.
> Bob
>
> On Wed, Jan 19, 2011 at 9:04 PM, Meteorites USA <eric at meteoritesusa.com> wrote:
>> Yeah, ?I wonder if anyone's ever etched a Campo crystal before?
>>
>> Eric
>>
>>
>> On 1/19/2011 6:48 PM, Michael Gilmer wrote:
>>>
>>> Hi Bob,
>>>
>>> AFAIK, these are made by taking a low-grade ruster or "dog" and
>>> freezing it in liquid nitrogen. ?Then frozen meteorite is then
>>> shattered and it fragments along the crystal-plane boundaries of the
>>> taenite and kamacite - the result is these "crystals" with a polished
>>> appearance.
>>>
>>> This process works best with coarse octahedrites of lower value like
>>> Campo and Nantan.
>>>
>>> Some people like them, some people don't. ?I think they are a neat way
>>> to "upcycle" a lower grade piece into something more marketable, but
>>> they are also a bit misleading because newbies may tend to think iron
>>> meteorites naturally look that way.
>>>
>>> Best regards,
>>>
>>> MikeG
>>>
>>> ----------------------------------------------------------------------
>>> Mike Gilmer - Galactic Stone& ?Ironworks Meteorites
>>>
>>> Website - http://www.galactic-stone.com
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>>> -----------------------------------------------------------------------
>>>
>>> On 1/19/11, Bob King<nightsky55 at gmail.com> ?wrote:
>>>
>>>>
>>>> Hi everyone,
>>>> This has been bugging me a while, but I've noticed lots of smaller
>>>> Campo del Cielos on eBay recently that look like very melted
>>>> Sikhote-Alins. Does anyone know what's going on with these? Is someone
>>>> blowing up Campos and melting down the pieces. Here's an example:
>>>> http://tinyurl.com/4nuvhwn
>>>> Thanks!
>>>> Bob
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Received on Wed 19 Jan 2011 10:23:21 PM PST