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Northwest Africa 13198
Basic information Name: Northwest Africa 13198
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13198
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 368 g
Meteoritical Bulletin:  MB 109  (2020)  LL6
Recommended:  LL6    [explanation]

This is 1 of 2940 approved meteorites (plus 2 unapproved names) classified as LL6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 16 Feb 2020
Writeup from MB 109:

Northwest Africa 13198 (NWA 13198)

(Northwest Africa)

Purchased: 2019 Mar

Classification: Ordinary chondrite (LL6)

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

Physical characteristics: Single stone with a dark brown fusion crust. Shock veins are visible in a dark main mass, with no distinction between chondrules and matrix.

Petrography: Minerals present include olivine and pyroxene, present in equal amounts, and minor plagioclase. Olivine and pyroxene grains show planar and irregular fractures. Olivine grains show some weak mosaicism. Accessory phases include metal/opaques (modal abundance: about 2.0%). Mineral grains have a maximum size of about 0.4 mm. Porphyritic (olivine, olivine-pyroxene, pyroxene) and non-porphyritic (granular olivine-pyroxene) chondrules have been recrystallized and do not show any boundaries with the surrounding matrix. Average chondrule diameter found is 0.8±0.4 mm (N=15). Thin (<0.2 mm) veins are present filled with carbonates.

Geochemistry: Mineral compositions and geochemistry: Pyroxene: Fs23.6±4.5En70.7±8.1Wo5.7±12.6, Fe/Mn=33.0±4.0, N=11; Olivine: Fa31.4±1.2Fo68.6±1.2, Fe/Mn=60.9±7.0, N=15; Plagioclase: An10.6±0.01Ab84.1±0.5Or5.3±0.5, N=3.

Classification: Ordinary chondrite (LL6, S4, W2)

Specimens: 21.9 g at Ubayr including a thin scetion. Main mass owned by S. Tutorow.

Data from:
  Table 0
  Line 0:
Date:P 2019 Mar
Mass (g):367.5
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):31.4±1.6 (N=15)
Ferrosilite (mol%):23.6±4.5 (N=11)
Wollastonite (mol%):5.7±12.6 (N=11)
Classifier:V. Szlachta, UBayr
Type spec mass (g):21.9
Type spec location:UBayr
Main mass:S. Tutorow
Comments:Field name G722.; 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 9765 approved meteorites from (Northwest Africa) (plus 1865 unapproved names)

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