[meteorite-list] Spade Versus Estacado

From: Michael L Blood <mlblood_at_meteoritecentral.com>
Date: Thu Apr 22 10:16:37 2004
Message-ID: <BB74E993.A19E%mlblood_at_cox.net>

Bernd's observations and opinion are good enough for this cowboy.
       Also, isn't Matt's meteorite a US find? Matt's integrity is beyond
question in my book.
       Michael


on 8/29/03 9:00 AM, Adam Hupe at adamhupe_at_comcast.net wrote:

> Dear List Members,
>
> If somebody wants to sell an Estacado specimen and a Spade specimen to us at
> the Denver show we would be happy to donate them to a world class researcher
> who will also be at the show for comparative purposes. We are in the
> process of working with several laboratories to sort out NWA pairings
> (mainly the stony-irons) and have provided several samples to each facility.
> We have found that shock and weathering levels amongst other things are
> variable even from the same strewn field in many cases.
>
> The evenly disbursed, fine-grained metal gives Estacado the appearance that
> there is more metal than there actually is. I have only seen this texture in
> one other H chondrite and that is NWA 1792 before looking at Spade. Add the
> darkened matrix and you have a pretty stunning looking meteorite. After
> cutting thousands of NWA meteorites I have only seen this texture once, in
> my opinion making it rare. I think all suspected pairings should be
> investigated to keep the books clean, so to speak.
>
> All the best,
>
> Adam Hupe
>
>
>
>
>
>
> ----- Original Message -----
> From: <bernd.pauli_at_paulinet.de>
> To: <Meteorite-list_at_meteoritecentral.com>
> Sent: Friday, August 29, 2003 8:38 AM
> Subject: [meteorite-list] Spade Versus Estacado
>
>
>> Hello once again,
>>
>> Another possible inconsistency:
>>
>> My Estacado thin section measures 2.3 x 1.6 cm (3.68 cm^2)
>> and I found at least 7 relict POP chondrules and 1 relict, barred
>> chondrule.
>>
>> This would also be in clear contrast to A.E. Rubin's statement:
>>
>> "The impact melt origin of [Spade] is indicated by the low
>> modal abundances of relict chondrules (1.8 vol.%) ..."
>>
>> Bernd
>>
>>
>> ______________________________________________
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>
>
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Received on Fri 29 Aug 2003 02:29:23 PM PDT