Hi Richard and All,
Not sure about Tafassasset being like Zaklodzie, but NWA 4301 is a
dead-ringer for it. In fact, if they were found in close proximately, they
would be paired! Here is the description and approved classification I use
for NWA 4301 when ever I offer it (see Meteoritical Bulletin link below):
NWA 4301 Zaklodzie-Like Ungrouped Meteorite
Specimen Information:
Name: NWA 4301 Ungrouped Enstatite-rich Achondrite
NWA 4301, an exceedingly rare Ungrouped Enstatite-rich Achondrite found in
Algeria in 2006 by nomadic tribesman. NWA 4301 is nearly identical to
Zaklodzie, both in mineral composition and terrestrial age, about 300 years
(The same scientist at NSF Arizona AMS Laboratory measured the terrestrial
age dates of both meteorites). If they had not fallen 3000 km apart, NWA
4301 would have been considered a pairing. While that is unlikely,
scientists agree they are most likely source launch-paired! The Total Known
Weight of NWA 4301 consists of a single 685 gram stone.
Close-up view of polished slice of NWA 4301 (depth of field = 2cm across):
http://www.lunarrock.com/nwa4301/nwa4301closeup.jpg
Scientists write:
"This meteorite [NWA 4301] is essentially a clone of Zaklodzie, for which.a
very young terrestrial age of several hundreds of years [was found] (even
though it is weathered to some extent). I presume that the terrestrial ages
of these two are analytically distinguishable, but it could still be that
they are launch-paired."
"NWA 4301 seems much fresher than Zaklodzie."
"I believe that the [terrestrial ages] are permissive of both stones being
part of the same fall, but landing 3000 km apart in Poland and Algeria. Of
course there is a very large uncertainty, so it does not prove it, but the
two meteorites are remarkably similar and different from anything else."
Approved classification published in Meteoritical Bulletin 91 for NWA 4301:
Northwest Africa 4301
Mauritania or Algeria
Find: April 2006
Enstatite achondrite (ungrouped)
History: Purchased in April 2006 by G. Hupé from a Moroccan dealer in Rabat.
Physical characteristics: A single 685 g stone with some reddish external
weathering.
Petrography: (A. Irving and S. Kuehner, UWS)
Subequigranular igneous cumulate texture with relatively coarse-grained
(0.2-0.8 mm) silicate, metal, and sulfide grains. Composed mainly of
polysynthetically twinned pure enstatite = 70 vol% and kamacite = 15 vol%,
with subordinate interstitial plagioclase = 10 vol% and troilite = 5 vol%.
Micrometer-size blades and blebs of kamacite and rare daubreelite also occur
as inclusions within enstatite.
Mineral composition: Plagioclase (An30.7-37.6Or1.8-1.3).
Classification: Enstatite achondrite (ungrouped). Terrestrial weathering has
produced some limonite along grain boundaries. This specimen is very similar
in texture and mineral compositions to Zaklodzie.
Type specimen: A total of 22.9 g, one polished thin section and one polished
mount, are on deposit at UWS. G. Hupé holds the main mass.
<<
Link to Meteoritical Bulletin for NWA 4301:
http://www.lpi.usra.edu/meteor/metbull.php?code=35416
BTW, The link I use that gets through to the List is:
[email protected]
Best regards,
Greg
====================
Greg Hupe
The Hupe Collection
NaturesVault (eBay)
[email protected]
www.LunarRock.com
IMCA 3163
====================
Click here for my current eBay auctions:
http://search.ebay.com/_W0QQsassZnaturesvault
----- Original Message -----
From: "Richard Montgomery" <[email protected]>
To: "Meteorites USA" <[email protected]>; "Meteorite-list"
<[email protected]>
Sent: Sunday, November 21, 2010 8:04 PM
Subject: Re: [meteorite-list] Aliens are real!
Okay, this is the best chance to pose my question, off topic, of course,
just like this thread.
Dear LIST, what address to I use to initiate a thread? Everything I try
never gets posted. As in my last attempt to inquire about any study
comparing Tafassasset with Zaklodzie. I know I'm doing something
wrong...who can enlighten me? (Promise not to spam with
ET-ice-alien-slag-iron-rarities...)
Sincerely, Richard Montgomery
----- Original Message -----
From: "Meteorites USA" <[email protected]>
To: "Meteorite-list" <[email protected]>
Sent: Sunday, November 21, 2010 3:06 PM
Subject: [meteorite-list] Aliens are real!
I started writing a response to the latest post about aliens, but figured
it was way off topic and it got a bit corny anyway. Rather than post it
direct to the list, I posted it on the site.
Sci-Fi junkies wanting a good laugh should read! ;)
http://www.meteoritesusa.com/aliens-are-real.html
Enjoy...
Eric
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