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Northwest Africa 12833
Basic information Name: Northwest Africa 12833
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12833
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1269 g
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 274 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Oct 2019
Writeup from MB 108:

Northwest Africa 12833 (NWA 12833)

(Northwest Africa)

Purchased: 2019 Mar

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Darryl Pitt in March 2019 from a dealer in Agadir, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia consisting of subophitic eucrite clasts plus related crystalline debris. Minerals are exsolved pigeonite, low-Ca pyroxene, calcic plagioclase, silica polymorph, ilmenite, baddeleyite, troilite and rare Ni-free metal. Minor secondary calcite veinlets and barite are present.

Geochemistry: Orthopyroxene (Fs61.5-62.4Wo1.7-2.2, FeO/MnO = 32-33, N = 2), clinopyroxene (Fs27.1-29.2Wo42.5-40.1, FeO/MnO = 30-32, N = 3), low-Ca pyroxene (Fs58.2-50.2Wo6.0-5.1, FeO/MnO = 32, N = 2), plagioclase (An82.2Or1.0; An91.1-92.7Or0.2; N = 3).

Classification: Eucrite (monomict breccia).

Specimens: 22.7 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2019 Mar
Mass (g):1269
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):58.2-59.2; 61.5-62.4; 27.1-29.2
Wollastonite (mol%):6.0-5.1; 1.7-2.2; 42.5-40.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):22.7
Type spec location:UWB
Main mass:D. Pitt
Comments:Work name MVCH 478; submitted by A. Irving
   and collections
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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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