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Northwest Africa 13330
Basic information Name: Northwest Africa 13330
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13330
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 147.5 g
Recommended:  Eucrite-br    [explanation]

This is 1 of 217 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Jul 2020
Writeup from MB 109:

Northwest Africa 13330 (NWA 13330)

(Northwest Africa)

Purchased: 2019 Nov

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased by Shawn Kashay in November 2019 from Moroccan dealer Mostapha Hnini.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Highly shocked breccia composed of microgabbroic eucrite clasts plus related crystalline debris within a quench-textured, partly vesicular matrix (exhibiting some variations in grainsize in different parts of the studied thin section). The major constituents are unexsolved pigeonite (pale orange in thin section) and calcic plagioclase, both of which have been recrystallized into aggregates of extremely small subgrains; accessory phases include silica polymorph, subcalcic augite, Ti-Al-bearing chromite, Cr-bearing ulvöspinel, ilmenite, rare troilite, and secondary calcite and Ca sulfate. Subgrains within recrystallized pigeonite exhibit normal core to rim compositional zoning.

Geochemistry: Microgabbroic lithic clast: pigeonite (cores Fs47.6-49.3Wo9.4-10.4, FeO/MnO = 30-31, N = 3; rims Fs52.8-53.6Wo11.2-13.6, FeO/MnO = 31-33, N = 3), plagioclase (An89.4-90.1Or0.4-0.6, N = 4). Melt matrix: pigeonite (cores Fs43.9-45.9Wo9.7-10.8, FeO/MnO = 29-30, N = 2; rims Fs51.5-53.9Wo15.2-15.4, FeO/MnO = 32-34, N = 2), subcalcic augite (Fs55.5Wo31.4, FeO/MnO = 34), plagioclase (An88.1Or0.2).

Classification: Eucrite (melt-matrix breccia, microgabbroic, highly shocked).

Specimens: 33.3 g including one polished thin section at PSF; remainder with Mr. S. Kashay.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Nov
Mass (g):147.5
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):43.9-49.3; 51.5-53.9
Wollastonite (mol%):9.4-10.8; 11.2-15.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):33.3
Type spec location:PSF
Main mass:S. Kashay
Comments:Work name SK20-1; 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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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