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Northwest Africa 13220
Basic information Name: Northwest Africa 13220
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13220
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 630 g
Recommended:  H3    [explanation]

This is 1 of 663 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 23 Feb 2020
Writeup from MB 109:

Northwest Africa 13220 (NWA 13220)

(Northwest Africa)

Purchased: 2019 Oct

Classification: Ordinary chondrite (H3)

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

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Relatively small, unequilibrated glass-bearing chondrules (apparent diameter 370 ± 200 µm, N = 20) are set in a finer grained matrix containing abundant fresh metal, troilite, chromite, Cl-free apatite and chlorapatite.

Geochemistry: Olivine (Fa18.7±3.5, range Fa14.0-27.6, N = 9; Cr2O3 in ferroan examples <0.06 wt.%, N = 5), low-Ca pyroxene (Fs15.9±0.4Wo0.9±0.7, range Fs15.5-16.4Wo0.3-1.8, N = 4; Fs5.1Wo0.4).

Classification: Ordinary chondrite (H3). Likely paired with "HC8" and "HC11".

Specimens: 44.5 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):630
Shock stage:S2
Weathering grade:W0/1
Fayalite (mol%):18.7±3.5
Ferrosilite (mol%):15.9±0.4
Wollastonite (mol%):0.9±0.7
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):44.5
Type spec location:PSF
Main mass:Harkness Collection
Comments:Work name HC7; 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)
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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