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Northwest Africa 13202
Basic information Name: Northwest Africa 13202
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13202
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 396 g
Classification
  history:
Recommended:  Chondrite-ung    [explanation]

This is 1 of 26 approved meteorites classified as Chondrite-ung.   [show all]
Search for other: Ungrouped chondrites
Comments: Approved 29 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13202 (NWA 13202)

(Northwest Africa)

Purchased: 2020 Jan

Classification: Ungrouped chondrite

History: A very dense, metal-rich specimen, found as two naturally-broken pieces which fit together, was purchased in January 2020 by Mark Lyon from a dealer in Zagora, Morocco.

Physical characteristics: The broken surfaces on both pieces are coated by rusty terrestrial weathering products. Polished interior surfaces exhibit dominant fresh metal (with minimal staining) and subordinate interspersed silicate-rich regions.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) The specimen consists of two distinct interspersed components with overall proportions of ~75% metal and ~25% silicate-rich material. Metal-rich regions (up to 0.5 mm) are composed of 95% kamacite with 5% taenite, and contain fine grained metal plates ranging from 100 to 500 μm in diameter. Silicate-rich regions (up to 0.5 mm) contain a variety of chondrules (with apparent diameters ranging from ~100 to 1500 μm). Most chondrules are glass-bearing (PP, PO, POP and barred pyroxene types) but some are cryptocrystalline. Accessory phases in silicate-rich regions include kamacite, taenite, chromite, troilite, merrillite and chlorapatite.

Geochemistry: Olivine (Fa24.6±3.9, range Fa15.5-28.0, N = 16), low-Ca pyroxene (Fs15.8±1.4Wo1.5±0.9, range Fs14.6-19.6Wo0.6-3.5, N = 11), pigeonite (Fs14.8-15.1Wo8.3-9.1, N = 2), kamacite (Ni = 4.8-7.0 wt.%, N = 7), taenite (Ni = 16.5-21.3 wt.%, N = 3).

Classification: Chondrite (ungrouped, metal-rich). Paired with NWA 12273 and NWA 12379.

Specimens: 20.0 g including one polished slice at UWB; remainder with Mr. M. Lyon.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2020 Jan
Mass (g):396
Pieces:2
Class:Chondrite-ung
Shock stage:S2
Weathering grade:W0/1
Fayalite (mol%):24.6±3.9
Ferrosilite (mol%):15.8±1.4
Wollastonite (mol%):1.5±0.9
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):20.0
Type spec location:UWB
Main mass:M. Lyon
Comments:Work name RC128.1; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
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 7228 approved meteorites from (Northwest Africa) (plus 1998 unapproved names)

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