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Northwest Africa 12397
Basic information Name: Northwest Africa 12397
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12397
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 21.2 g
Meteoritical Bulletin:  MB 108  (2020)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 263 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 27 Mar 2019
Writeup from MB 108:

Northwest Africa 12397 (NWA 12397)

(Northwest Africa)

Purchased: 2014

Classification: Mesosiderite

Physical characteristics: 3 × 2 × 2.5 cm in size. A well rounded sample with red brown staining and visible surface weathering.

Petrography: Composed mainly of Opx and Plg. Opx ranges from few μm to 2740 μm. Plg ranges from few μm to 160 μm. FeNi metal ranges from 50 μm to 1480 μm and sulfides from 10 μm to 1070 μm. Opaques comprise approximately 20% of sample. Weakly Shocked: plagioclase displays minor undulose extinction and no melt veins or melt pockets are visible. Moderately weathered: pervasive Fe Oxide veining, some oxidation of metal and sulfides.

Geochemistry: Low Ca pyroxene: Fs 26.4±0.5Wo2.2±0.4 n=37; Feldspar: An91.7±1.6Ab8.0±1.5, n= 23. Oxygen isotopes (Ziegler, UNM): δ17O=1.992±0.07, δ18O=4.323±0.42, Δ17O=-0.291±0.02 per mil (n=2)

Classification: Mesosiderite

Specimens: Catalogued at the ROM as LM57788

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2014
Mass (g):21.17
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):26.37±0.52
Wollastonite (mol%):2.20±0.35
Classifier:V. Di Cecco (ROM)
Type spec mass (g):4.46
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by V. Di Cecco (ROM)
Plots: O isotopes:  
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 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)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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