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Northwest Africa 12771
Basic information Name: Northwest Africa 12771
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12771
Observed fall: No
Year found: 2016
Country: Morocco
Mass:help 4.2 kg
Meteoritical Bulletin:  MB 108  (2020)  L6
Recommended:  L6    [explanation]

This is 1 of 11582 approved meteorites (plus 10 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 27 Jun 2019
Writeup from MB 108:

Northwest Africa 12771 (NWA 12771)


Purchased: Feb 2016

Classification: Ordinary chondrite (L6)

History: Purchased from a Moroccan dealer in 2016.

Physical characteristics: Physical Characteristics: Single rectangular stone, 4.2 kg, with blocky, iceberg style, orange-brown weathering and black fusion crust with shallow regmaglypts. Saw cut reveals patchy light and dark areas with sparse deformed chondrules. Darker areas cut by 1 mm shock veins and patches, iron oxide staining.

Petrography: (K. Domanik and J. Satkoski, UAz) The meteorite is highly recrystallized, especially in light-colored areas. A few remnant, deformed chondrules were observed. Secondary plagioclase grains range up to 200 μm in size. Maskelynite is present in pockets near opaque shock veins. Olivine has well-defined mosaic extinction. No ringwoodite was found in shock veins or pockets. Kamacite, troilite, and chromite are also present.

Geochemistry: Mineral compositions and geochemistry: Olivine Fa25.2 ± 1.0, Fe/Mn=48.0 ± 3.4, n=20; low-Ca pyroxene Fs20.9±0.8Wo1.7±0.7, Fe/Mn=30.0 ± 2.5, n=15.

Classification: Ordinary Chondrite (L6), Weathering grade W2

Specimens: 20 g including polished thin section on deposit at UAz, J. Satkoski holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P Feb 2016
Mass (g):4200
Shock stage:S5
Weathering grade:W2
Fayalite (mol%):25.2±1.0
Ferrosilite (mol%):20.9±0.8
Wollastonite (mol%):1.7±0.7
Classifier:K. Domanik and J. Satkoski, UAz
Type spec mass (g):20
Type spec location:UAz
Main mass:J. Satkoski
Comments:Submitted by K. Domanik
   and collections
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 1680 approved meteorites from Morocco (plus 25 unapproved names) (plus 1 impact crater)

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