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Northwest Africa 13197
Basic information Name: Northwest Africa 13197
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13197
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 679 g
Recommended:  H5    [explanation]

This is 1 of 10864 approved meteorites (plus 19 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 16 Feb 2020
Writeup from MB 109:

Northwest Africa 13197 (NWA 13197)

(Northwest Africa)

Purchased: 2019 Mar

Classification: Ordinary chondrite (H5)

History: Purchased from a dealer in Morocco in March 2019.

Physical characteristics: Physical Characteristics: the 4 stone pieces of the repository specimen are rounded with rugged surfaces and lack of fusion crust. The stones have a dark reddish color with light grey chondrules clasts, showing a dark colored matrix and oxidized metal.

Petrography: (N. Ma, UBT) Individual chondrules vary from 0.1 to 2 mm but most chondrules are 0.3-0.7 mm in diameter. Various groups of chondrules (75 area%) are present with PO, GOP and C types as the most abundant. The shape of chondrules remains for most of them sharp against the matrix. Matrix is recrystalized to few-micrometer sized crystals with dispersed oxidized metallic veins under reflected light and in BSE images. Metal (~5%) is only oxidized around the rims, but oxidized veins from terrestrial weathering are found penetrating into the matrix and chondrules.

Geochemistry: Mineral compositions and geochemistry: Olivine (Fa18.0±0.2; Fe/Mn35±4; n=31), Orthopyroxene (Fs15±1Wo4±1, n=3).

Classification: Ordinary Chondrite (H5, W2, S2).

Specimens: 64.3 g including a thin section on deposit at UBayr, S. Tutorow holds the main mass.

Data from:
  Table 0
  Line 0:
Date:P 2019 Mar
Mass (g):678.9
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):18.0±0.2 (N=31)
Ferrosilite (mol%):15±1 (N=3)
Wollastonite (mol%):4±1 (N=3)
Classifier:N. Ma, UBayr
Type spec mass (g):64.3
Type spec location:UBayr
Main mass:S. Tutorow
Comments:Field name G721.; submitted by A. Bouvier, UBayr
   and collections
UBayr: Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany (institutional address; updated 5 Feb 2020)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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