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Northwest Africa 13637
Basic information Name: Northwest Africa 13637
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13637
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 8.6 g
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 248 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 18 Jan 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13637 (NWA 13637)

Algeria

Purchased: April 2020

Classification: Lunar meteorite (feldspathic breccia)

History: The stone was purchased by M. Lyon from a Moroccan dealer in April 2020. Later a Hungarian collector imported the stone.

Physical characteristics: Originally an individual cuboid-shaped (2 × 2 × 1.5 cm) gray stone without fusion crust. The sample was covered with orange-brown desert sand. Different colored clasts and thin (<0.2 mm) black veins and cracks are presented on the surface of the stone. Cut surface reveals coherent black matrix material. Inside the matrix there are several shiny metal grains and many white, gray and green clasts. Few fine orange-brown material filled cracks transect the sample.

Petrography: (D. Rezes, CSFK) The meteorite is a complex and polymict lunar feldspathic regolith breccia with many glass spherules (<100 µm). Most of the spherules are intact from shock effects. Melt flow textures are not presented in the sample. The matrix is fine-grained (<100 µm). Clast types are in wide range, impact melt clasts are most common. Impact melt breccia, granulitic impact melt breccia, basalt, micro-gabbro, anorthosite and granulite clasts are presented too. Most clasts are fractured, diameters are up to 2 mm. Major mineral phases are olivine, pyroxene and feldspar. Accessory chromite, FeNi-metal (<0.75 mm), silica, ilmenite, troilite, apatite and baddeleyite are presented. Weathering products are FeNi-oxides, barite and calcite.

Geochemistry: (D. Rezes and M. Szabo, CSFK) Olivine Fa24.9±6.8, Fe/Mn=86±21, N=22; pyroxene Fs33.7±17.9Wo14.2±11.1, Fe/Mn=58±13, N=76; plagioclase An96.2±2.4Ab3.7±2.4Or0.1±0.2, N=50; Matrix average composition SiO2=44.2±0.4, TiO2=0.5±0.0, Al2O3=26.4±1.1, Cr2O3=0.2±0.0, FeO=6.0±0.7, MgO=10.1±0.7 CaO=13.1±0.6, N=3 (all in wt%); Glass spherules average composition SiO2=43.3±3.7, TiO2=0.3±0.1, Al2O3=26.1±1.8, Cr2O3=0.2±0.1, FeO=5.7±2.4, MnO=0.0±0.1, MgO=9.5±1.0, CaO=15.1±0.8, Na2O=0.2±0.2, N=12 (all in wt%). Bulk composition: (K. Gmeling and Zs. Kasztovszky, KFKI) NAA+PGAA gave the following mean abundances: (in wt%) FeO 8.9, Na2O 0.35; (in ppm) Sc 22.6, La 5.91, Sm 2.43, Eu 0.93, Yb 2.46, Lu 0.33, Hf 2.32, Th 1.98.

Classification: Lunar feldspathic regolith breccia

Specimens: 2.3 g on deposit at CSFK, D. Rezes holds the main mass (6.3 g) including one polished thin section.

Data from:
  MB110
  Table 0
  Line 0:
Date:P April 2020
Mass (g):8.6
Pieces:1
Class:Lunar (feldsp. breccia)
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):24.9±6.8 (15.1-42.0, N=22)
Ferrosilite (mol%):33.7±17.9 (13.0-85.0, N=76)
Wollastonite (mol%):14.2±11.1 (0.5-44.0, N=76)
Classifier:D. Rezes, CSFK
Type spec mass (g):2.3
Type spec location:CSFK
Main mass:D. Rezes
Comments:Work name: RDNWAx1; submitted by D. Rezes; submitted by Daniel Rezes
Institutions
   and collections
CSFK: Research Center for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Miklós út 15-17.l Hungary, Hungary (institutional address; updated 7 Apr 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Rezes         
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1153 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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