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Northwest Africa 12379
Basic information Name: Northwest Africa 12379
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12379
Observed fall: No
Year found: 2017 or 2018
Country: Morocco
Mass:help 765 g
Classification
  history:
Recommended:  Chondrite-ung    [explanation]

This is 1 of 25 approved meteorites classified as Chondrite-ung.   [show all]
Search for other: Ungrouped chondrites
Comments: Approved 4 Feb 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12379 (NWA 12379)

Morocco

Find: 2017 Aug to 2018 Sep

Classification: Ungrouped chondrite

History: Found between August 2017 and September 2018 close to the border between Morocco and Algeria

Physical characteristics: (Luc Labenne) Five individuals covered by typical NWA iron meteorite desert patina and very well preserved inside.

Petrography: (C. A. Jansen, Frank E. Brenker, J. Zipfel, Senck, A. N. Krot, UH) The meteorite is very metal-rich consisting of ~70 vol% Fe,Ni, ~25-30 vol% silicates, <5 vol% troilite and is completely free of matrix. Minor quantities of Fe-oxides, probably of terrestrial origin, are present. The silicate portion is dominated by abundant, well-rounded chondrules up to 1.2 mm, mostly POP, PO and PP types. Many chondrules are fragmented. Metal phases are predominantly kamacite; taenite and tetrataenite are rarer. Accessory troilite occurs as coarse isolated grains, occasionally associated with tetrataenite. Merrillite, chlorapatite and chromite are found inside metal grains and in peripheral parts of some chondrules.

Geochemistry: Mineral compositions and geochemistry: Porphyritic chondrules: olivine Fa25.3±3 (Fa18.1-28.5, median Fa26.5, Cr2O3=0.03±0.02 wt%; FeO/MnO=53.6±5.9, N=36); low-Ca pyroxene Fs14.7±3.7Wo1.4±1.3 (Fs3.2-18.7Wo0.2-4.5, median Fs15.8Wo0.8, N=19). Isolated low-Ca pyroxene grains enclosed by metal and low-Ca pyroxene phenocrysts in some chondrules are replaced to various ° by Fe-rich olivine (Fa27.3±0.6; FeO/MnO=53.8±4.1; N=13). This data was acquired by EPMA. Oxygen isotopes: (A. Pack, UGött) δ17O=3.69‰, δ18O=5.14‰, Δ17O=+0.96‰.

Classification: Chondrite (ungrouped). Based on the chemical composition of the silicate fraction as well as the common presence of chromite and phosphates in combination with oxygen isotopes the sample shows affinity to ordinary chondrites. The olivine Fa content is not homogenized throughout the sample and the standard deviation is within the range of type 3 ordinary chondrites. The high metal content, however, is inconsistent with ordinary chondrite. Based on its petrographic and geochemical properties and oxygen isotope data, this meteorite is probably paired with NWA 12273. Luc Labenne for providing important information and a second sample for oxygen isotope analyses.

Data from:
  MB108
  Table 0
  Line 0:
Date:2017 Aug to 2018 Sep
Mass (g):765
Pieces:5
Class:Chondrite-ung
Fayalite (mol%):25.3±3 (18.1-28.5, N=36)
Ferrosilite (mol%):14.7±3.7 (3.2-18.7, N=19)
Wollastonite (mol%):1.4±1.3 (0.2-4.5, N=19)
Classifier:C. A. Jansen, GUF, J. Zipfel, Senck, A. N. Krot, UH
Type spec mass (g):20
Type spec location:NHMD
Main mass:Luc Labenne
Comments:Submitted by C. A. Jansen, GUF
Plots: O isotopes:  
Institutions
   and collections
UH: Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai'i, 2525 Correa Road, Honolulu, HI 96822, United States (institutional address; updated 25 Oct 2011)
Senck: SENCKENBERG Forschungsinstitut und Naturmuseum Frankfurt Senckenberganlage 25 60325 Frankfurt am Main Germany, Germany (institutional address; updated 4 Apr 2011)
NHMD: Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark. , Denmark; Website (institutional address; updated 17 Aug 2012)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
GUF: Institut für Geowissenschaften, Goethe Universität, Altenhaerallee 1, 60438, Frankfurt am Main, Germany (institutional address; updated 13 Dec 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1405 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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