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Northwest Africa 13313
Basic information Name: Northwest Africa 13313
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13313
Observed fall: No
Year found: 2019
Country: Mali
Mass:help 987 g
Recommended:  L3-6    [explanation]

This is 1 of 62 approved meteorites classified as L3-6.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 13 Jun 2020
Writeup from MB 109:

Northwest Africa 13313 (NWA 13313)


Purchased: 2019 Apr

Classification: Ordinary chondrite (L3-6)

History: Purchased by Mbark Arjdal in April 2019 from dealer in Timbuktu, Mali.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, fairly closely packed, relatively unequilibrated chondrules (apparent diameter 830±450 µm, N = 23), plus some equilibrated Type 6 clasts containing sparse chondrules, are set in a finer grained matrix containing kamacite, taenite, Ti-chromite, chlorapatite, merrillite and troilite. A large fine grained, igneous-textured clast (1.9 cm across) is composed of reversely zoned olivine microphenocrysts plus extremely fine grained interstitial quench products (with Ca pyroxene-like bulk composition).

Geochemistry: Olivine in chondrules (Fa25.6±5.6, range Fa22.7-36.9, Cr2O3 < 0.03 wt.%, N = 6), low-Ca pyroxene (Fs21.6±3.1Wo1.3±0.1, range Fs19.9-26.2Wo1.2-1.4, N = 4), subcalcic augite (Fs6.0Wo36.3), augite (Fs6.9±0.1Wo45.8±0.5, range Fs6.8-7.0Wo46.1-45.4, N = 2), olivine in Type 5 clast (Fa25.1), olivine in fine grained igneous clast (core Fa23.0, rims 11.1-16.6; N = 3). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.79.

Classification: Ordinary chondrite (L3-6 breccia).

Specimens: 29.2 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  Table 0
  Line 0:
Place of purchase:Timbuktu, Mali
Date:P 2019 Apr
Mass (g):987
Shock stage:S2
Weathering grade:W1/2
Fayalite (mol%):25.6±5.6
Ferrosilite (mol%):21.6±3.1
Wollastonite (mol%):1.3±0.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):29.2
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 214; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 93 approved meteorites from Mali (plus 2 unapproved names)

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