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Northwest Africa 7208
Basic information Name: Northwest Africa 7208
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7208
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 39 g
Meteoritical Bulletin:  MB 100  (2012)  CV3
Recommended:  CV3    [explanation]

This is 1 of 602 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 10 Apr 2012
Writeup from MB 100:

Northwest Africa 7208 (NWA 7208)

(Northwest Africa)

Purchased: 2010 Feb

Classification: Carbonaceous chondrite (CV3)

History: One stone was purchased by an anonymous buyer in Tucson, USA, in February 2010.

Physical characteristics: A 39 g stone covered with a brown-black fusion crust.

Petrography: (M.A. Ivanova, Vernad) The meteorite consists of fine-grained matrix, chondrules to 2 mm, and abundant refractory inclusions to several mm. One big (1.5 cm) dark inclusion was found in the section. Minor phases include spinel, chromite, magnetite, sulfides, and Fe,Ni metal grains in olivine. The dark inclusion consists of smaller chondrules (< 1 mm) and their fragments, isolated olivine grains, opaques embedded in a fine-grained matrix.

Geochemistry: Olivine Fa0.44-35. Low-Ca pyroxene Fs0.68-7.0Wo0.9-4.8, plus augite and diopside in refractory inclusions. Olivine in dark inclusion is Fa0.52-53 and low-Ca pyroxene is Fs1.8-6.0Wo0.4-2.71. Oxygen isotopic compositions: (I. A Franchi and R. C Greenwood, OU, by laser fluorination): δ18O = 1.038; δ17O = -3.465, Δ17O = -4.005 (all per mil). Oxygen isotopic composition of the dark inclusion is: δ18O = 5.16, δ17O = -0.32, Δ17O = -2.72 (all per mil).

Specimens: 8.23 g and one polished section are on deposit at Vernad. The anonymous buyer holds the main mass.

Data from:
  Table 1
  Line 1678:
Place of purchase:Tucson, USA
Date:P 2010 Feb
Mass (g):39
Fayalite (mol%):0.44-35
Ferrosilite (mol%):0.68-7.0
Wollastonite (mol%):0.9-4.8
Classifier:M. A. Ivanova, Vernad
Type spec mass (g):8.23
Type spec location:Vernad
Main mass:anonymous
Comments:Submitted by C. A. Lorenz
Plots: O isotopes:  
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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