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Northwest Africa 12883
Basic information Name: Northwest Africa 12883
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12883
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 148 g
Meteoritical Bulletin:  MB 108  (2020)  H5-6
Recommended:  H5-6    [explanation]

This is 1 of 125 approved meteorites classified as H5-6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 7 Sep 2019
Writeup from MB 108:

Northwest Africa 12883 (NWA 12883)

(Northwest Africa)

Purchased: 2015

Classification: Ordinary chondrite (H5-6)

History: A sculpted, oriented 148 g stone was given to Marc Jost (SJS) by Aziz Mouadine at the Munich Mineral Show 2015 as a gift.

Physical characteristics: The sample has a pronounced nosecone with radial flow lines emanating from the point and a rollover lip covering a rim around the trailing edge. The cut face shows the interior has a brecciated texture composed of chondritic clasts set within a host of chondrules suspended in a dark-colored matrix.

Petrography: Description and Classification: (A. Love, App) Sample has a brecciated texture composed of up to 2.5 cm rounded, recrystallized, chondritic clasts set in a shock-darkened host of chondrule fragments. Host in between clasts is composed of distinct chondrules and fragments set within a metal-sulfide-rich shock-melted matrix. All textural types of chondrules are represented and they show an average apparent diameter 430 µm. Sample contains ~7 vol% FeNi metal.

Geochemistry: (A. Love, App) Olivine (Fa17.9±0.2, Fe/Mn=37.2±0.7, N=12), low Ca pyroxene (Fs15.9±0.1Wo1.1±0.1, Fe/Mn=20.8±0.6, N=8).

Classification: Ordinary chondrite (H5-6 breccia, C-S3, W1). Sample is an H chondrite based upon mineral compositions, magnetic susceptibility and chondrule diameters. Host is type 5 based upon distinct chondrules with equilibrated compositions. Clasts are type 6 based upon recrystallized texture and equilibrated compositions.

Specimens: Marc Jost (SJS) holds the main mass. A polished thin section and a 24.4 g slice are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Munich Mineral Show
Date:P 2015
Mass (g):148
Shock stage:C-S3
Weathering grade:W1
Fayalite (mol%):17.9±0.2
Ferrosilite (mol%):15.9±0.1
Wollastonite (mol%):1.1±0.1
Magnetic suscept.:5.35
Classifier:A. Love, App
Type spec mass (g):24.4
Type spec location:App
Main mass:Marc Jost (SJS)
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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