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Northwest Africa 11750
Basic information Name: Northwest Africa 11750
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11750
Observed fall: No
Year found: 2016
Country: Morocco
Mass:help 8.5 g
Classification
  history:
Recommended:  C3.00-ung    [explanation]

This is the only approved meteorite classified as C3.00-ung.
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments: Approved 19 Apr 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11750 (NWA 11750)

Morocco

Purchased: 2016 May

Classification: C3.00-ung

History: The meteorite was reportedly found near Foum Zguid. It was bought by Pierre-Marie Pelé in Morocco in May 2016 and a subsample was sent to CEREGE for classification. In view of its scientific interest, the whole stone was eventually given to CEREGE by Pierre-Marie Pelé.

Physical characteristics: Black irregular stone. Cut surface reveals a dark homogeneous interior.

Petrography: (J. Gattacceca, B. Devouard, H. Pourkhorsandi, CEREGE; L. Bonal, IPAG) Chondrules and mineral fragments (26 vol%) set in a fine-grained iron-rich matrix (74 vol%, modal abundances by point counting N=204). Average chondrule apparent size 240±170 μm (N=28). Opaque are mostly FeNi metal (both in matrix and chondrules) and sulfides with typical grain size about 10 μm. In the matrix, FeNi metal and sulfides are finely intermixed. Saturation magnetization is Ms=2.39 Am2/kg indicating a bulk metal content of at least 1.1 wt%. Hysteresis properties show the significant presence of tetrataenite in the form of cloudy zone (Gattacceca et al., 2014). XRD over a ~1 cm2 area on a polished section (D. Borschnek, B. Devouard, CEREGE) does not reveal the presence of hydrous phases (serpentine, tochilinite) typically observed in type 2 chondrites using the same experimental setup. The absence of hydrous phases in the fine-grained matrix is confirmed by IR transmission spectra. Raman spectra of the fine-grained matrix reveal the presence of polyaromatic carbonaceous matter characterized by a structural order comparable to type 2 chondrites, thus reflecting a peak metamorphic temperature lower than in the least metamorphosed type 3 chondrites (e.g., Semarkona)

Geochemistry: Olivine Fa11.9±17.1, range Fa0.8-45.1, PMD 126% (N=7). Ferroan olivine has Cr2O3 0.24±0.16 wt% (N=3). Orthopyroxene Fs3.2±2.2Wo3.8±1.1 (N=3). Kamacite Fe 91.0, Ni 6.7, Co, 2.3 (N=1). Taenite Fe 67.2, Ni 29.6, Co 0.9 (atom%). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of a 1.5 mg aliquot of a powdered 40 mg bulk sample is δ17O=3.47, δ18O=14.3, Δ17O=-4.0, all per mil (linearized, slope 0.5247, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.03.

Classification: C3.00-ung. The type 3 derives from the unequilibrated nature, the absence of phyllosilicates and abundance of metal. The subtype 3.00 derives from Raman spectroscopy. The ungrouped designation derives from the oxygen isotopes and petrography.

Specimens: Main mass and type specimen at CEREGE.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016 May
Mass (g):8.49
Pieces:1
Class:C3.00-ung
Weathering grade:minimal
Fayalite (mol%):11.9±17.1 (N=7)
Ferrosilite (mol%):3.2±2.2 (N=3)
Wollastonite (mol%):3.8±1.1
Magnetic suscept.:4.03
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):1.69
Type spec location:CEREGE
Main mass:CEREGE
Comments:work name CC1701; submitted by Jerome 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 29 Oct 2018)
IPAG: Institut de Planétologie et d’Astrophysique de Grenoble 414, Rue de la Piscine Domaine Universitaire 38400 St-Martin d’Hères , France (institutional address; updated 1 Aug 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Christophe PICQ   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1370 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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