Can someone familiar with testing Acapulcoites contact me off list please.
I have questions about this stone:
http://i27.photobucket.com/albums/c165/jedisdiamond/uNWA46gec2a.jpg
Thanks,
Greg C.
__
http://www.meteoritecentral.com
I'm must be missing something. What could one conclude by comparing thin
sections of NWA 725 and a known winonaite? I understand that distinguishing
among acapulcoites, lodranites and winonaites is not a textural exercise nor
can they be resolved by just their mineral composition.
Hello
Hmm ?!?
Just noticed something contradictory:
The winonaites are texturally similar to acapulcoites, but the winonaites
contain coarser grains and abundant crosscutting metal-sulfide veins.
Marvin's pic of the Acapulco thin section shows grains that are coarser
than the ones of NWA 1054 but
--- [EMAIL PROTECTED] ha scritto:
Unortunately I still don't have a thin section of an
acapulcoite but the one pictured
in Marvin Killgore's Color Atlas of Meteorites in
Thin Section on pages 208-211
(Acapulco) surely looks different than the winonaite
on pages 232-235 (NWA 1054).
but
hello
this is the official study and analysis
http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1808.pdf
Matteo
--- [EMAIL PROTECTED] ha scritto:
Hmm ?!?
Just noticed something contradictory:
The winonaites are texturally similar to
acapulcoites, but the winonaites
contain coarser
http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1808.pdf
Matteo, thank you for the link. An interesting detail with regard to NWA 725's
status as a winonaite or an acapulcoite might be this conclusion by the authors
at the end of the paper:
... the Cr2O3 contents of high-Ca pyroxenes, (1.56 -
Hmm-ing again :-)
The winonaites are texturally similar to acapulcoites, but the winonaites
contain coarser grains and abundant crosscutting metal-sulfide veins.
Could this by a typo because:
Marvin's pic of the Acapulco thin section shows grains that are coarser
than the ones of NWA 1054 ...
- Original Message -
From: [EMAIL PROTECTED]
To: Meteorite-list@meteoritecentral.com
Sent: Thursday, February 16, 2006 11:02 AM
Subject: [meteorite-list] Acapulcoites and NWA 725
I'm must be missing something. What could one conclude by comparing thin
sections of NWA 725 and a known winonaite? I
John Kashuba
Ontario, California
- Original Message -
From: [EMAIL PROTECTED]
To: Meteorite-list@meteoritecentral.com
Sent: Thursday, February 16, 2006 11:02 AM
Subject: [meteorite-list] Acapulcoites and NWA 725
I'm must be missing something. What could one
conclude
John Kashuba
Ontario, California
- Original Message -
From: [EMAIL PROTECTED]
To: Meteorite-list@meteoritecentral.com
Sent: Thursday, February 16, 2006 11:02 AM
Subject: [meteorite-list] Acapulcoites and NWA 725
I'm must be missing something. What could one
conclude
Ayyy!!!
No, such strings are as old as the mountains - it's always the same tkw-,
number-salad-, pairing issue.
The old crux of all NWA-material, of which really each collector should be
aware.
And if a collector or a seller can't cope with that situation, he should
switch to the names
The supposedly paired NWA 2656 - 2699 - 2871
have alone 7.5kg - 1.294 - 3.47 together 12kg = more than half of all
Acap-material on Earth.
to clear things up - my 3.47kg is part of the 7.5kg written about in 2656
NWA 725 has 3.8kg
Dho 125 7.5kg
Acapulco 1.9kg
NWA 725 is likely to
NWA 725 is likely to actually a winonaite. I had
Open University do o
isotopse on some paired material and it plots right
on top of nwa 1463
NWA 725 its similar to my NWA 1058 and my NWA 1058 its
classificated primitive achondrite like winonaite, but
others put this to a acapulcoite,
FLOSS C. et al. (2002) Acapulcoite complexities: Clues from
trace element distributions (MAPS 37-7, 2002, A047, excerpts):
1. Acapulcoites and lodranites are primitive achondrites from a common parent
body that experienced variable degrees of partial melting and melt migration.
2. NWA 725
Hello Martin,
As for NWA 725, here are the details as Stan shared them with me:
Recent O-isotopic analysis of a probable paired stone (number pending)
by the Open University resolves the material clearly within the
winonaite field:
In particular, the D17O value of -0.431 is in reasonable
Stan and David kindly wrote:
As for NWA 725, here are the details as Stan shared them with me:
Recent O-isotopic analysis of a probable paired stone...by the Open
University resolves the material clearly within the winonaite field.
Hello List,
Does anyone have a NWA 725 thin section and a
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