[meteorite-list] AD: Special: NWA 6659 prov. - Superior Lodranite

From: Marcin Cimala <marcin_at_meteoritecentral.com>
Date: Wed, 16 Nov 2011 19:55:16 +0100
Message-ID: <CDA8AD972C2B41ED8520A34B36022CA4_at_meteorytf1cafb>

Great specimen, but any photos of entire mass ?
:)

>
> Dear meteorite friends,
>
>
> in our weekly Special we're able this time to present you a wonderful
> dainty: NWA 6659 - a Lodranite!
>
> Lodranites are counted among the absolutely rarest classes a meteorite
> collector can have in his cabinet and a meteoricist in his lab.
> Currently the Meteorite Bulletin Database accounts for only 32 lodranitic
> numbers with a combined weight of 9.39kg (15 of them with 1.14kg yielded
> the
> Antarctic campaigns of the last 35 years). And 9 numbers not otherwise
> specified as belonging to the acapulcoite-lodranite family with 0.33kg
> (7 Antarctics) - making the lodranites to a much rarer type than any lunar
> meteorite.
>
> Let us say as long-time established meteorite offerers, that it was the
> NWA-complex of the recent decade, which brought the lodranites at all in
> the
> range of the collector and a certain variety of finds into the research
> institutes. A check of our global price compilation of the season ten
> years
> ago only (660 different meteorites, 92 offerers - currently available in
> the
> German meteorite forum), gives, that the only chance to get a lodranite
> was
> then to acquire micromounts of Lodran, priced at an average of 38,400$ a
> gram and that among the related acapulcoites, the collector had only the
> choice between Acapulco (average 1408$/g) and Monument Draw (1016$/g).
>
> Lodranites and acapulcoites share common ground and are generic relatives
> from the same parent body, which seems to have had consisted of a CM or
> CI-like precursor material. The main differences between these types is
> the
> lack of plagioclase in the lodranites and the larger grain-sizes than the
> acapulcoites display, hence indicating that lodranites underwent during
> their melt phase higher temperatures and a different cooling period,
> stemming from deeper layers than the acapulcoites.
> However, as enigmatic that group perhaps still might be - it are just the
> very recent years with these new desert finds, which lead science to
> develop
> a better understanding of the composition and the complex thermal history
> of
> the acapulcoite-lodranite parent body.
> A perfect overview of the brand-new models and hypotheses you will find on
> David Weir's meteorite studies pages.
>
> The perhaps a little provocative title of this Special we chose, because
> most lodranitic specimens in our collections are recruited from the large
> pairing group, which was revised from ACAP to LOD and where we once all
> tried to put the numbers together here on the list (NWA 2565/2714/2866
> seqq.)
> And we regard NWA 6659 as definitely more comely.
> It is better preserved than the old group, which had weathering grades of
> W3
> and W3-4.
> Not only the crystals of NWA 6659 are still relatively fresh-looking - it
> has even here and there some metal grains and of course:
> Yes - the so highly desired Triple Junctions superabound.
>
> All slices were grinded and polished successively with 6 different grits;
> and you find them here:
>
> http://www.chladnis-heirs.com/specials/special-nwa6659.html
>
>
> Regarding the statistics from above, keeping in mind, that the Great
> Desert
> Area is coming to an end and emphasizing that we price NWA 6659 at the
> lowest edge of the lodranite spectrum, we think, that these specimens are
> not only of highest interest for the advanced collector, but would
> wholeheartedly commend them as an excellent choice also for the beginning
> meteorite enthusiast, as one-and-only specimen for having an perfect
> representative, once and for all, of that fascinating and so exceedingly
> rare class.
>
>
> Best regards,
> Stefan & Martin
>
> Chladni's Heirs
> Munich - Berlin
> Fine Meteorites for Science & Collectors
>
> http://www.chladnis-heirs.com
>
>
>
>
>
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Received on Wed 16 Nov 2011 01:55:16 PM PST