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Néma 001
Basic information Name: Néma 001
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2022
Country: Mauritania
Mass:help 75.8 g
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 138 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 8 Oct 2022
Writeuphelp
Writeup from MB 111:

Néma 001        16.650°N, 7.247°W

Hodh ech Chargui, Mauritania

Find: 2021 Sep 08

Classification: Ungrouped achondrite

History: Found in the Mauritanian Sahara.

Physical characteristics: A single 68.1 g stone mostly covered with thin glassy fusion crust. One face is devoid of fusion crust and has a pale orange color due to terrestrial weathering. A few pale orange fragments from the same stones were also found in the immediate vicinity, amounting to 7.7 g. The cut face show white and greenish crystals several mm in size

Petrography: (J. Gattacceca, CEREGE) Fractured unbrecciated coarse igneous rock with 5 mm grain size and subophitic texture. Main mineral are albitic plagioclase, orthopyroxene and Ca-pyroxene. Approximate modal abundances (from the polished section, likely not representative of the bulk stone in view of the grain size) are orthopyroxene 57 vol%, plagioclase 30 vol%, olivine 3 vol%. Accessory minerals: ilmenite (to 100 μm), chromite (to 60 μm, often associated with Fe-Mg-Ti spinels), kamacite (to 100 μm rounded grains and as small µm-sized blebs in silicates), troilite. Kamacite and troilite are often associated. One 50 × 10 μm euhedral K-feldspar grain was observed, set in plagioclase.

Geochemistry: Orthopyroxene Fs19.5±0.1Wo1.9±0.3, FeO/MnO = 14.9±0.7 (n=5). Ca-pyroxene Fs7.1±0.2Wo46.2±0.3, Cr2O3 1.3±0.1 wt%, FeO/MnO = 11.4±0.7 (n=3). Plagioclase An7.8±1.1Ab86.4±0.6Or5.8±0.5 (n=5). Sanidine An1.5Ab42.9Or55.6 (n=1). Olivine Fa23.3±0.3, FeO/MnO = 24.8±1.4 (n=21). Chromite Cr# = 0.90 (n=2). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.9 mg aliquot of a powdered 7 mg bulk sample is δ17O=0.624‰, δ18O=3.257‰ , Δ17O=-1.070‰ (slope 0.52, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively). Magnetic susceptibility measured on the 68.1 g main mass is log χ (× 10-9 m3/kg) = 3.03.

Classification: Achondrite, ungrouped. Ungrouped based on mineral chemistry and texture. Oxygen isotopic composition suggests a possible genetic link with acapulcoites and lodranites.

Specimens: Type specimen at CEREGE. The main mass is with Isselmou Kaye (Nouakchott, Mauritania); 5 g of fragments with Labenne.

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Hodh ech Chargui
Date:2021 Sep 08
Latitude:16.650°N
Longitude:7.247°W
Mass (g):75.8
Pieces:several
Class:Achondrite-ung
Weathering grade:low
Fayalite (mol%):23.3±0.3 (n=21)
Ferrosilite (mol%):19.5±0.1 (n=5)
Wollastonite (mol%):1.9±0.3
Magnetic suscept.:3.03
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):16.6
Type spec location:CEREGE
Main mass:Isselmou Kaye (Nouakchott, Mauritania)
Finder:Ahmed ould Ahmed Beybatt
Comments:work name CM115 (LABMET 01FEB22A); submitted by Jérôme Gattacceca
Plots: O isotopes:  
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Photos:
CreditPhotos
Public domain photographs:
Jerome Gattacceca            
Geography:

Mauritania
Coordinates:
     Recommended::   (16° 39' 0"N, 7° 14' 49"W)

Statistics:
     This is 1 of 2 approved meteorites from Hodh ech Chargui, Mauritania
     This is 1 of 201 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)
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