[meteorite-list] Opinions on an oddball meteorite I cut open

From: Meteorites USA <eric_at_meteoritecentral.com>
Date: Tue, 30 Jun 2009 19:22:38 -0700
Message-ID: <4A4AC86E.7050503_at_meteoritesusa.com>

Hey Mike, Jason, List,

The term "very low" when referring to magnetism in a stone meteorite is
"very subjective" isn't it? Is there a scale to go by, or industry
standard for strength of magnetism? I've had stone material that a super
strong and very large neo magnet would barely stick to.

Also wouldn't small slices such as this piece and others be hard to
determine types due to the small mass. I mean, a small 10 gram stone
wouldn't be completely representative of an entire mass if that mass is
unknown would it? I've seen and cut some chondrites with dual
lithologies but if I cut those stones in half down the separation line
of the mineral types, how would you know what type it is?

Regards,
Eric



Jason Utas wrote:
> Hola,
> Check out the last picture - there's a white chondrule clearly visible
> in the upper right/center of the photo.
> Also note the dark chondrule (large, but fuzzy) at the bottom edge of
> the slice, a tad to the left of center.
> I'd go with LL6; it has a few chondrules, and from what I understand,
> the type seven designation is reserved for primitive achondrites. Of
> course, it's hard to gauge L vs LL, but you did say that the magnetism
> was "very low."
> Regards,
> Jason
>
> On Tue, Jun 30, 2009 at 2:11 PM, Galactic Stone &
> Ironworks<meteoritemike at gmail.com> wrote:
>
>> Hi Listees!
>>
>> I'd like some opinions on a meteorite I cut open yesterday. It's an
>> oddball I've had in my box of NWA for some time - awaiting a date with
>> the saw. It exhibits a very low magnetism and it has a grey matrix
>> almost entirely devoid of chondrules - although there does appear to
>> be some remnant chondrule structures. I'm hoping it might be some
>> kind of achondrite, but the magnetism mostly rules that out. Is it
>> some uncommon type like an L7? Or is it just something common that I
>> have not seen before?
>>
>> The exterior has a wind polished desert varnish on it and there
>> doesn't appear to be any fusion crust to speak of - although there are
>> a few scattered tiny patches of black on it. The stone weighs 16
>> grams. I only made 2 cuts - I cut one corner off to expose the matrix
>> (endcut) and I made one thin slice. The rest of the stone is intact.
>>
>> Here are some photo links -
>>
>> http://i268.photobucket.com/albums/jj24/Meteoritethrower/Meteorites/Anomalous/new-odd-cut/odd-new-1.jpg
>>
>> http://i268.photobucket.com/albums/jj24/Meteoritethrower/Meteorites/Anomalous/new-odd-cut/odd-new-2.jpg
>>
>> http://i268.photobucket.com/albums/jj24/Meteoritethrower/Meteorites/Anomalous/new-odd-cut/odd-new-3.jpg
>>
>> Any opinions are welcomed.
>>
>> Best regards,
>>
>> MikeG
>>
>> --
>> .........................................................
>> Michael Gilmer (Louisiana, USA)
>> Member of the Meteoritical Society.
>> Member of the Bayou Region Stargazers Network.
>> Websites - http://www.galactic-stone.com and http://www.glassthrower.com
>> ..........................................................
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-- 
Regards,
Eric Wichman
Meteorites USA
http://www.meteoritesusa.com
904-236-5394

Received on Tue 30 Jun 2009 10:22:38 PM PDT