[meteorite-list] nice chondrule

From: M come Meteorite Meteorites <mcomemeteorite2004_at_meteoritecentral.com>
Date: Tue Nov 8 16:18:11 2005
Message-ID: <20051108211351.58954.qmail_at_web26211.mail.ukl.yahoo.com>

Uhmm....I remember this slice ;-)

NWA 2180

? Morocco

? Found 2002

? Carbonaceous chondrite

A number of stones, totally weighing 369.3 g was
bought in Erfoud (Morocco) by an anonymous buyer. The
main mass is weighing 51.4 g. Classification and
mineralogy (G.Pratesi, V.Moggi Cecchi, MSP): a cut
surface on the type specimen displays rather large
chondrules and some small white spots. In thin section
several chondrules of various kinds (POP, PO, BO, RP)
accounting for ~50% vol. and ranging from 500 to 600
?m are visible, set in a fine intergrowth of
microcrysts of phyllosilicates. Two clusters of
olivine composition ranging from Fa0.18 to Fa9.93 mol.
% and from Fa31.32 to Fa44.49 mol. % in the
chondrules. A mean value of . Orthopyroxene is
enstatitic (En98.10, Wo1.09). A pigeonitic pyroxene
with variable composition is also present
(Fs0.95-0.45, En59.42-93.22, Wo39.63-6.33). Chondrules
glass is anorthitic (An90.33, Ab9.67 mol. %). Fe,Ni
alloy and troilite are rather uncommon (less than 5%
vol.). Rare apatite grains and CAIs are present.
Oxygen isotope measurements (I.Franchi, R.Greenwood,
Open University) O16/O18 =
. Based on texture,
mineralogy, chemistry and OI data, the meteorite is
classified as a
. carbonaceous chondrite. Terrestrial
weathering grade is rather low (W1); optical features
indicate a low shock stage (S1). Specimens: main mass
with buyer; type specimen (20.5 g) and thin section,
MSP.

main mass

http://it.geocities.com/mcomemeteoritecollection/NWA2180gr.51.4.JPG

a slice

http://it.geocities.com/mcomemeteoritecollection/NWA2180gr.8.9.JPG


Matteo

--- Sergey Vasiliev <petrovich_at_sv-meteorites.com> ha
scritto:

> Hi list,
> I just want to share a pictures I made today.
> It is CV3(not published yet) or at least it looks
> like that for me - NWA
> 2180:
> http://sv-meteorites.iol.cz/nwa2180a.jpg
> http://sv-meteorites.iol.cz/nwa2180b.jpg
> Enjoy!
> Sergey
> --------------------------------------------
> Sergey Vasiliev
> U Dalnice 839
> Prague 5, 15500
> Czech Republic
> http://www.sv-meteorites.com
>
>
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M come Meteorite - Matteo Chinellato
Via Triestina 126/A - 30030 - TESSERA, VENEZIA, ITALY
Email: mcomemeteorite2004_at_yahoo.it
Sale Site: http://www.mcomemeteorite.it
Collection Site: http://www.mcomemeteorite.info
MSN Messanger: spacerocks at hotmail.com
EBAY.COM:http://members.ebay.com/aboutme/mcomemeteorite/


        

        
                
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Received on Tue 08 Nov 2005 04:13:51 PM PST