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Northwest Africa 13251
Basic information Name: Northwest Africa 13251
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13251
Observed fall: No
Year found: 2008
Country: Western Sahara
Mass:help 101 g
Classification
  history:
Recommended:  L-melt rock    [explanation]

This is 1 of 37 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 21 Mar 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13251 (NWA 13251)

Western Sahara

Purchased: 2008

Classification: Ordinary chondrite (L, melt rock)

History: Purchased in 2008 from a Moroccan meteorite and mineral dealer in Erfoud for JTESM, then sold to an anonymous owner. Meteorite is reportedly from Western Sahara.

Physical characteristics: The exterior has a dark brown to black appearance with lighter-colored red-tan areas. Interior slices reveal mm-scale blebs of metal and sulfide in a very fine-grained, dark-gray matrix.

Petrography: (C. Herd, UAb) Optical and microprobe examination of a polished thin section shows Fe-Ni metal and sulfide blebs as well as irregular to subrounded olivine or olivine+low-Ca pyroxene intergrowths up to 600 μm across containing μm-scale inclusions of troilite. These reside in a groundmass consisting of 10-50 μm scale crystallites of olivine and low-Ca pyroxene with interstitial glass of plagioclase composition. Shock effects include weak mosaicism and planar fractures in olivine.

Geochemistry: (C. Herd, UAb) Data obtained by EMP examination of carbon-coated thin section: Olivine Fa24.4±0.9 (n=63); Low-Ca Pyroxene Fs19.2±1.3Wo2.7±1.0 (n=42). No difference in composition between olivine and low-Ca pyroxene in intergrowths and olivine and low-Ca pyroxene in the groundmass was observed.

Classification: L, melt rock

Specimens: Type specimen of 20.8 g, including one thin section, is at UAb. Main mass with an anonymous owner.


Writeup from MB 109:

Northwest Africa 13251 (NWA 13251)

Western Sahara

Purchased: 2008

Classification: Ordinary chondrite (L, melt rock)

History: Purchased in 2008 from a Moroccan meteorite and mineral dealer in Erfoud for JTESM, then sold to an anonymous owner. Meteorite is reportedly from Western Sahara.

Physical characteristics: The exterior has a dark brown to black appearance with lighter-colored red-tan areas. Interior slices reveal mm-scale blebs of metal and sulfide in a very fine-grained, dark-gray matrix.

Petrography: (C. Herd, UAb) Optical and microprobe examination of a polished thin section shows Fe-Ni metal and sulfide blebs as well as irregular to subrounded olivine or olivine+low-Ca pyroxene intergrowths up to 600 μm across containing μm-scale inclusions of troilite. These reside in a groundmass consisting of 10-50 μm scale crystallites of olivine and low-Ca pyroxene with interstitial glass of plagioclase composition. Shock effects include weak mosaicism and planar fractures in olivine.

Geochemistry: (C. Herd, UAb) Data obtained by EMP examination of carbon-coated thin section: Olivine Fa24.4±0.9 (n=63); Low-Ca Pyroxene Fs19.2±1.3Wo2.7±1.0 (n=42). No difference in composition between olivine and low-Ca pyroxene in intergrowths and olivine and low-Ca pyroxene in the groundmass was observed.

Classification: L, melt rock

Specimens: Type specimen of 20.8 g, including one thin section, is at UAb. Main mass with an anonymous owner.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2008
Mass (g):101
Pieces:1
Class:L-melt rock
Shock stage:S4
Weathering grade:W0.0
Fayalite (mol%):24.4±0.9 (n=63)
Ferrosilite (mol%):19.2±1.3 (n=42)
Wollastonite (mol%):2.7±1.0 (n=42)
Classifier:C. Herd, UAb
Type spec mass (g):20.8
Type spec location:UAb
Main mass:anonymous
Comments:Submitted by C. Herd
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
JTESM: Joshua Tree Earth And Space Museum PO BOX 101, Lakeville, IN 46536, United States (institutional address; updated 17 Dec 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 223 approved meteorites from Western Sahara (plus 19 unapproved names)

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