Meteoritical Bulletin: Entry for Northwest Africa 13228

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Northwest Africa 13228

Basic information

Name: Northwest Africa 13228
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13228
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 142 g

Classification
history:

Recommended:

H3 [explanation]

This is 1 of 690 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

Writeup from MB 109:

Northwest Africa 13228 (NWA 13228)

(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 430 ± 290 µm, N = 22) are set in a finer grained matrix containing abundant fresh metal, troilite, chromite, Cl-free apatite and chlorapatite.

Geochemistry: Olivine (Fa_19.4±3.2, range Fa_17.3-34.7, N = 9; Cr₂O₃ in ferroan examples <0.08 wt.%, N = 6), low-Ca pyroxene (Fs_15.5±0.3Wo_0.8±0.5, range Fs_15.2-15.8Wo_0.3-1.6, N = 6).

Classification: Ordinary chondrite (H3). Likely paired with "HC7" and "HC8".

Specimens: 21.5 g including one polished thin section at PSF; remainder in the Harkness Collection.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Zagora
Date:	P 2019 Oct
Mass (g):	142
Pieces:	1
Class:	H3
Shock stage:	S2
Weathering grade:	W0/1
Fayalite (mol%):	19.4±3.2
Ferrosilite (mol%):	15.5±0.3
Wollastonite (mol%):	0.8±0.5
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	21.5
Type spec location:	PSF
Main mass:	Harkness Collection
Comments:	Work name HC11; submitted by A. Irving

Institutions
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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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