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Northwest Africa 13277
Basic information Name: Northwest Africa 13277
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13277
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 277 g
Classification
  history:
Recommended:  L-melt rock    [explanation]

This is 1 of 41 approved meteorites classified as L-melt rock.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 2 May 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13277 (NWA 13277)

(Northwest Africa)

Purchased: 2019

Classification: Ordinary chondrite (L, melt rock)

History: Purchased by Mark Lyon in December 2019 and January 2020 from a single Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen has an igneous texture and is moderately vesicular. Composed predominantly of compositionally-zoned olivine and polysynthetically-twinned low-Ca pyroxene with subordinate higher-Ca pyroxenes, sodic plagioclase, troilite, minor chromite and interstitial quenched glassy mesostasis. Much of the olivine is poikiliticially enclosed in pyroxene. Metal is almost completely absent except for one occurrence of kamacite in a large troilite grain. Minor secondary barite was observed.

Geochemistry: Olivine (Fa25.4±3.0, range Fa22.1-30.3, N = 9), low-Ca pyroxene (Fs22.2±0.2Wo3.2±0.4, range Fs22.02.9-3.6-22.4Wo, N = 3), subcalcic augite (Fs17.4-23.0Wo30.3-33.3; Fs39.7Wo36.2;N = 3), augite (Fs34.3Wo44.9), fayalite in matrix (Fa87.5), plagioclase (Ab77.3-84.3An15.3-6.0Or7.4-9.8, N = 2).

Classification: Ordinary chondrite (L-melt rock, vesicular, metal-poor). This material has some similarities to NWA 11253, although the metal content is much lower.

Specimens: 20.1 g including one polished thin section at UWB; remainder with Mr. M. Lyon.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):277
Pieces:several
Class:L-melt rock
Weathering grade:W0/1
Fayalite (mol%):25.4±3.0
Ferrosilite (mol%):22.2±0.2
Wollastonite (mol%):3.2±0.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSTL
Type spec mass (g):20.1
Type spec location:UWB
Main mass:M. Lyon
Comments:Work name Lyon19-6; 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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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