Meteoritical Bulletin: Entry for Northwest Africa 12833

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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: 1269 g

Classification
history:

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

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 (Fs_61.5-62.4Wo_1.7-2.2, FeO/MnO = 32-33, N = 2), clinopyroxene (Fs_27.1-29.2Wo_42.5-40.1, FeO/MnO = 30-32, N = 3), low-Ca pyroxene (Fs_58.2-50.2Wo_6.0-5.1, FeO/MnO = 32, N = 2), plagioclase (An_82.2Or_1.0; An_91.1-92.7Or_0.2; N = 3).

Classification: Eucrite (monomict breccia).

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

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Agadir
Date:	P 2019 Mar
Mass (g):	1269
Pieces:	2
Class:	Eucrite-mmict
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

Institutions
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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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