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Northwest Africa 13226
Basic information Name: Northwest Africa 13226
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13226
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 174 g
Recommended:  H3-4    [explanation]

This is 1 of 20 approved meteorites classified as H3-4.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 5 Apr 2020
Writeup from MB 109:

Northwest Africa 13226 (NWA 13226)

(Northwest Africa)

Purchased: 2019 Oct

Classification: Ordinary chondrite (H3-4)

History: Purchased by Grant Harkness in October 2019 from a dealer in Zagora, Morocco.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Part of this specimen consists of relatively small, unequilibrated glass-bearing chondrules (apparent diameter 380±230 µm, N = 23) set in a finer grained matrix containing abundant fresh metal, troilite, chromite, Cl-free apatite and chlorapatite. Also present in the studied thin section are several large (up to 2.5 cm across), angular H4 chondrite clasts. These lithic clasts are more recrystallized and more equilibrated than the majority of the specimen, and contain well-formed chondrules set in a relatively coarse grained matrix containing abundant relatively fresh metal.

Geochemistry: Olivine (Fa17.9±8.4, range Fa2.9-31.3, N = 6; Cr2O3 in ferroan examples <0.08 wt.%, N = 5), low-Ca pyroxene (Fs15.0±2.3Wo0.5±0.2, range Fs13.4-16.6Wo0.3-0.6, N = 2). H4 clast: olivine (Fa17.8±0.1, range Fa17.6-17.9, N = 6), low-Ca pyroxene (Fs17.5±2.9Wo1.2±0.1, range Fs16.0-21.9Wo1.0-1.3, N = 4), augite (Fs5.2Wo45.9).

Classification: Ordinary chondrite (H3-4 breccia). NWA 13220, NWA 13222, NWA 13226, and NWA 13228, which were obtained from the same source at the same time, are probably paired.

Specimens: 28.0 g including one polished thin section at PSF; remainder in the Harkness Collection.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2019 Oct
Mass (g):174
Shock stage:S2
Weathering grade:W0/1
Fayalite (mol%):17.9±8.4
Ferrosilite (mol%):15.0±2.3
Wollastonite (mol%):0.5±0.2
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):28.0
Type spec location:PSF
Main mass:Harkness Collection
Comments:Work name HC10; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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