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Northwest Africa 10324
Basic information Name: Northwest Africa 10324
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10324
Observed fall: No
Year found: 2015
Country: Morocco
Mass:help 141.6 g
Meteoritical Bulletin:  MB 104  (2015)  CR2
Recommended:  CR2    [explanation]

This is 1 of 183 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 14 Oct 2015
Writeup from MB 104:

Northwest Africa 10324 (NWA 10324)


Purchased: 2015 Mar 10

Classification: Carbonaceous chondrite (CR2)

History: Purchased in Erfoud, Morocco, on 2015 March 3.

Physical characteristics: One partly oriented stone with desert varnish weighing 141.6 g.

Petrography: (C. R. Heckel and J. Zipfel, Senck) Two polished sections show a texture of 50-60% chondrules and 30-35% fine-grained matrix. Chondrules range in size from 0.7 to 1.5 mm. They are dominated by type I PO and POP chondrules. Type II chondrules of PO and BO textures are rare. Some chondrules contain clear mesostasis. Up to 10% FeNi is present as rims around or as blebs within type I chondrules. Rare large metal rims also contain chromite inclusions and networks of troilite veins. Sulfide is predominantly present in the fine-grained matrix. Pervasive veins of metal and troilite are almost completely replaced by Fe-oxides.

Geochemistry: Mineral compositions and Geochemistry: EMPA data of Type I chondrules: olivine cores Fa3.3±1.3, N=24, olivine rims Fa1.7-20.7, N=17, low Ca-pyroxene Fs2.9±0.9Wo0.7±0.2, N=23, high Ca-pyroxene Fs2.2±1.0Wo43.5±2.6, N=7, mesostasis SiO2=45-55, Al2O3=16-33; CaO=11-19 (all in wt.%). Type II chondrules: olivine cores Fa16.7±2.5, N=9, olivine rims Fa33.7±3.3, N=6, mesostasis SiO2=65-67, Al2O3=15-17; CaO=4-5 (all in wt. %). Oxygen isotopes: (A. Pack, UGött) Analyses by laser fluorination gave: δ17O = 1.79, δ18O = 5.95, Δ17O = -1.37 (all per mil) and plot in the CR field.

Classification: Carbonaceous chondrites (CR2), low shock and moderate weathering levels.

Specimens: A total of 21 g is on deposit at Senck. The main mass holder is anonymous.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2015 Mar 10
Mass (g):141.6
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):3.3±1.3 (N=24)
Ferrosilite (mol%):2.9±0.9 (N=23)
Wollastonite (mol%):0.7±0.2 (N=23)
Classifier:C. R. Heckel and J. Zipfel, Senck
Type spec mass (g):21
Type spec location:Senck
Main mass:anonymous
Comments:AK15a; submitted by Jutta Zipfel
Plots: O isotopes:  
   and collections
Senck: SENCKENBERG Forschungsinstitut und Naturmuseum Frankfurt Senckenberganlage 25 60325 Frankfurt am Main Germany, Germany (institutional address; updated 4 Apr 2011)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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