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Northwest Africa 12493
Basic information Name: Northwest Africa 12493
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12493
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 702 g
Recommended:  H3-5    [explanation]

This is 1 of 83 approved meteorites classified as H3-5.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 18 Apr 2020
Writeup from MB 109:

Northwest Africa 12493 (NWA 12493)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (H3-5)

History: Purchased at Hamburg Mineral Show Dec. 2018.

Physical characteristics: 701.5 g black-brown stone fragment, partly covered by black fusion crust with one 1 cm metal inclusion. Cut face shows gray host with lighter and darker gray xenoliths.

Petrography: (R. Bartoschewitz, Bart) dark lithology: well defined chondrules (0.1-1.5 mm, av. ~0.4 mm) of various types and irregular metallic inclusions up to 10 mm (some with eutectic metal/troilite intergrowth) in a black opaque matrix. Light lithology: strongly recrystallized matrix with indistinct chondrules and metal.

Geochemistry: Dark H3: olivine Fa18.6±3.3 (range 13.1-30.7; n=34); low Ca pyroxene Fs16.3±2.5Wo1.1±0.6 (n=33); Ca pyroxene En69Fs17Wo14 (n=2); chromite CRAL=91, FFM=87 (n=2); kamacite Ni=6.7-7.9 wt%, Co=0.6 wt% (n=5). Light H5: olivine Fa18.5±0.8 (n=10), low Ca pyroxene Fs16.4±0.3Wo1.5±0.4 (n=4); Ca pyroxene En79Fs16Wo5 (n=1); chromite CRAL=83, FFM=85 (n=2); kamacite Ni=3.6-5.7 wt%, Co=0.6-0.7 wt% (n=3). Magnetic susceptibility log χ (× 10-9 m3/kg) = 5.55, ρ=3.69 g/cm3

Classification: Ordinary chondrite (H3-5, S2, W0)

Specimens: 26.1 g on deposit at Kiel, Bart holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Hamburg
Date:P 2018
Mass (g):701.5
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):18.9±2.4 (13.1-30.7; n=44)
Ferrosilite (mol%):16.3±1.7 (n=37)
Wollastonite (mol%):1.2±0.6
Magnetic suscept.:5.55
Classifier:R. Bartoschewitz
Type spec mass (g):26.1
Type spec location:Kiel
Main mass:Bart
Comments:NWA-RB02; submitted by R. Bartoschewitz
   and collections
Kiel: Geologisches und Mineralogisches Museum, Institut für Geowissenschaften, Christian-Albrechts-Universität Kiel, Ludewig-Mayn-Str. 10, D-24118 Kiel, Germany, Germany (institutional address; updated 13 Sep 2013)
Bart: Bartoschewitz Meteorite Laboratory, Weiland 37, D-38518 Gifhorn, Germany; Website (private address; updated 30 Nov 2019)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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