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Northwest Africa 13520
Basic information Name: Northwest Africa 13520
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13520
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 719 g
Recommended:  L(H)3    [explanation]

This is 1 of 4 approved meteorites classified as L(H)3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 16 Dec 2020
Writeup from MB 109:

Northwest Africa 13520 (NWA 13520)

(Northwest Africa)

Purchased: 2008

Classification: Ordinary chondrite (L(H)3)

History: Purchased by Pat Brown in 2008 from an unknown NWA dealer in Tucson, Arizona.

Physical characteristics: Single partially crusted stone; fusion crust is light brown.

Petrography: (D. Sheikh, FSU) Sample is an ordinary chondrite composed of abundant chondrules (Av. 850±100 µm, n=30) set in a mostly opaque, slightly fine-grained matrix. Accessory phases include troilite and iron oxides.

Geochemistry: Olivine (Fa16.9±6.4, range Fa3.4-23.9, n=21), Cr2O3 in ferroan olivine (0.05±0.03 wt%, range <0.03 to 0.13, n=18) Low-Ca Pyroxene (Fs9.4±5.4Wo1.1±1.2, range Fs1.2-17.6Wo0.1-3.8, n=16).

Classification: Ordinary Chondrite (L(H)3) Cr2O3 in ferroan olivines is ~0.05 wt%, suggesting a high type 3 subtype (~3.8). While a few olivine grains are centered around Fa23, suggesting an L group, the majority of them are FeO-poor compared to L3 chondrites. No olivine grains above Fa24 were found. Likewise, no low-ca pyroxene grains were found above Fs17. The observation of FeO-poor silicates relative to L3 chondrites leads to the L(H)3 classification.

Specimens: 28.98 grams at UCLA; main mass with Pat Brown.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P 2008
Mass (g):719
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):16.9±6.4
Ferrosilite (mol%):9.4±5.4
Wollastonite (mol%):1.1±1.2
Magnetic suscept.:4.3
Classifier:D. Sheikh, FSU
Type spec mass (g):28.98
Type spec location:UCLA
Main mass:Pat Brown
Comments:Submitted by Daniel Sheikh
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Public domain photographs:
Daniel Sheikh   

     This is 1 of 8390 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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