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Northwest Africa 11253
Basic information Name: Northwest Africa 11253
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11253
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 40 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  L-melt rock
Recommended:  L-melt rock    [explanation]

This is 1 of 35 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 15 Aug 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11253 (NWA 11253)

(Northwest Africa)

Purchased: 2017 Mar

Classification: Ordinary chondrite (L, melt rock)

History: Purchased by Aras Jonikas in March 2017 from a Moroccan dealer.

Physical characteristics: A single pale brown stone (40 g) with small vesicles and sparse partly weathered, subspherical metal grains.

Petrography: (A. Irving and S. Kuehner, UWS) Annealed microgabbroic texture (grainsize 0.1-0.4 mm) with vesicles. Some prismatic pyroxene grains are present, but grain boundaries between other grains exhibit triple junctions. Minerals are olivine, very finely exsolved pyroxenes (both low-Ca and high-Ca), oligoclase, chromite, merrillite, chlorapatite, troilite, very sparse but irregularly distributed kamacite (overall <0.2 vol.%, some as partly altered subspherical grains) and minor barite.

Geochemistry: Olivine (Fa25.2-25.6, FeO/MnO = 47-50, N = 3), low-Ca pyroxene (Fs20.7-20.9Wo4.5-4.4, FeO/MnO = 32-35, N = 3), high-Ca pyroxene (Fs10.9-11.5Wo38.8-36.8, FeO/MnO = 26-30, N = 3), plagioclase (An10.1-13.7Or5.0-2.9, N = 2). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 3.843, 4.145, 4.029; δ18O 5.192, 5.734, 5.524; Δ17O 1.102, 1.117, 1.112 per mil.

Classification: L-melt rock (vesicular). This specimen apparently has affinities with L chondrites, but the paucity of metal and the presence of exsolution lamellae in pyroxenes are anomalous features.

Specimens: 8.2 g including one polished thin section at PSF; remainder with Mr. A Jonikas.

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017 Mar
Mass (g):40
Pieces:1
Class:L-melt rock
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):25.2-25.6
Ferrosilite (mol%):20.7-20.9
Wollastonite (mol%):4.5-4.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):8.2
Type spec location:UWB
Main mass:A. Jonikas
Comments:Work name AJ17-4; submitted by A. Irving
Plots: O isotopes:  
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)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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