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Northwest Africa 12874
Basic information Name: Northwest Africa 12874
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12874
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 192 g
Classification
  history:
Recommended:  Winonaite    [explanation]

This is 1 of 36 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 6 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12874 (NWA 12874)

(Northwest Africa)

Purchased: 2019

Classification: Primitive achondrite (Winonaite)

History: The meteorite was purchased from a Morrocan meteorite dealer on the meteorite fair in Ensisheim, France.

Physical characteristics: Three dark brownish fragments with some fusion crust.

Petrography: The meteorite displays a recrystallized texture dominantly composed of typically 100 to 200 µm sized enstatite, forsteritic olivine, and augite grains, with enstatite being the most abundant mineral phase. Augite often contains low-Ca pyroxene exsolutions. 120 degree triple junctions are abundant. Minor phases include kamacite, schreibersite, and troilite. Contains veinlets of metal or Fe-oxide throughout. Neither feldspar nor chondrules were observed.

Geochemistry: olivine: Fa3.3±0.1 (Fa3.2-3.4 FeO/MnO=15±1, n=13); low-Ca pyroxene: Fs3.6±0.4Wo1.4±0.2 (Fs3.3-4.5Wo1.2-1.7, FeO/MnO=10±1, n=13); Ca-pyroxene: Fs1.7±0.4Wo45.4±0.4 (Fs1.2-2.3Wo44.6-46.3, FeO/MnO=8±3, n=13); feldspar: An11.5±0.3Ab83.5±0.6Or5.0±0.7, n=17

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2019
Mass (g):192
Pieces:3
Class:Winonaite
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):3.3
Ferrosilite (mol%):3.6; 1.7
Wollastonite (mol%):1.4; 45.4
Magnetic suscept.:4.75
Classifier:A. Greshake, MNB
Type spec mass (g):24.6
Type spec location:MNB
Main mass:Hanno Strufe
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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