[meteorite-list] Help: Mystery 19th Cent. Meteorite Thin Section

From: Kashuba <mary.kashuba_at_meteoritecentral.com>
Date: Tue, 01 Sep 2009 15:10:52 -0700
Message-ID: <006001ca2b51$1279d4c0$376d7e40$_at_kashuba@verizon.net>

Mike, Bernd, List,

I don't know how much light I can shed on the matter. I understand it takes
at least 750 watts.

As usual Bernd has done some nicely directed research that might help key
this one out. If Tom still has the slide he might spin it in his 'scope to
get a feel for how shocked it is. Are those splotchy shadows in some of his
views evidence of mosaicism?

Another tack would be to get thin sections of the pairing suspects for
comparison. You might find common features like iron staining (or not),
broken chondrules and mineral grains (or not), odd clasts of one type or
another (or not) etc. I don't have any of the three mentioned but Anne
Black might find a couple of them in the large collection she just received.
It probably would not be definitive, but it WOULD be fun and that's what
this is about!

Regards,

- John

John Kashuba
Ontario, California

-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Mike
Bandli
Sent: Tuesday, September 01, 2009 1:36 PM
To: bernd.pauli at paulinet.de; Meteorite-list at meteoritecentral.com
Subject: Re: [meteorite-list] Help: Mystery 19th Cent. Meteorite Thin
Section

Thanks for the storm of ideas, Bernd. It looks like this one will take some
more time and expertise. I wonder if John Kashuba might shed some light on
(through) this TS? What are some other ideas for the notations on the bottom
label? 'Ct' could be an old abbreviation for county, which would point to
Homestead, though it is typically 'Co.' It would seem odd to abbreviate a
short word like city. Perhaps the '61' and 1861 are a coincidence and the 61
is simply the number assigned to that slide.

Fun stuff!

Thanks,

Mike Bandli
www.HistoricMeteorites.com
IMCA #5765

-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of
bernd.pauli at paulinet.de
Sent: Tuesday, September 01, 2009 12:44 PM
To: Meteorite-list at meteoritecentral.com
Subject: [meteorite-list] Help: Mystery 19th Cent. Meteorite Thin Section

A few ideas after brainstorming a bit

 ... what brain? :-)

Mike B. writes:

" Iowa has three official chondrites to its name prior to his passing.
Marion, 1847 (L6), Homestead, 1875 (L5) and Forest City, 1895 (H5)"

*If* it's Marion, you might find veins because Marion is described as having
veins.

*If* it's Homestead, it should be brecciated and severely shocked (S4).

*If* it's Forest City, it should also show brecciation.

Hmm, Homestead and Forest City, ... both brecciated :-(

But: Measuring the diameters of the chondrules might help here as Forest
City
chondrules (H5) should be smaller than Homestead chondrules (L5).

By the way, just in case your thin section should contain copper, ...
Homestead
is described as containing copper.

Best wishes from
Germany,

Bernd

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Received on Tue 01 Sep 2009 06:10:52 PM PDT