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Northwest Africa 13135
Basic information Name: Northwest Africa 13135
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13135
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 58.3 g
Recommended:  Ureilite    [explanation]

This is 1 of 623 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 9 Feb 2020
Writeup from MB 109:

Northwest Africa 13135 (NWA 13135)


Purchased: 2018 Apr

Classification: Ureilite

History: One piece with a weight of 58.3 g was purchased by Sergey Vasiliev from a Moroccan meteorite dealer in Zagora in 2018.

Physical characteristics: Dark-brown individual with well preserved fusion crust. The interior of the meteorite is grayish, with granular texture.

Petrography: (P. Yu. Plechov, FMMR). Petrographic observation of a polished section shows that the meteorite is composed of coarse-grained olivine (up to 2 mm) and fine pigeonite (size up to 400 µm). Olivine grains are Fo80.5 and elevated CaO (0.38±0.05 wt.%, n=13) and Cr2O3 (0.78±0.06 wt.%, n=13) abundances. No high-Ca pyroxene or orthopyroxene were observed. Pigeonite has 5.5-6.0 wt.% CaO. Saw-tooth, carbon-rich veins cross the meteorite. Veins or vein fragments with thicknesses of about 50 μm are composed by graphite (without diamond). Thinner veins of about 20 μm thickness contain kamacite with schreibersite rims and troilite-daubreelite intergrowths. Narrower veins, up to 10 μm in thickness, are mostly filled with iron hydroxides. Olivines have reduced rims with very tiny (<<1 µm) drops of iron (without Ni) and more magnesium than the cores (up to Fo87.8). These features are typical for olivine-pigeonite, main group ureilites (monomict ureilites). Irregularly shaped cracks and the absence of other features of impact indicate the sample has a very weak shock stage. Kamacite is partially replaced by iron hydroxides, whereas sulfides and silicates are fresh.

Geochemistry: Mineral composition and Geochemistry: EDS-WDS analyses (P. Yu. Plechov, FMMR). Ureilite consists of olivine Fa19.5±0.13, CaO 0.38±0.05 wt.% and Cr2O3 0.78±0.06 wt.% (N=13), pigeonite Fs16.10±0.27Wo11.58±0.26 (N=13), kamacite (in wt.%): Fe-94.22, Ni-4.57, troilite, daubreelite (in wt.%): Fe-52.54, S-32.66, Cr-7.96, schreibersite or nickelphosphide, graphite, iron and hydroxides.

Classification: (P. Yu. Plechov, FMMR). Ureilite.

Specimens: Sergey Vasiliev holds main mass 44.7 g. 13.6 g FMMR.

Data from:
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2018 Apr
Mass (g):58.3
Shock stage:low
Weathering grade:low
Fayalite (mol%):19.5±0.13 (N=13)
Ferrosilite (mol%):16.1±0.3 (N=13)
Wollastonite (mol%):11.6±0.3 (N=13)
Classifier:P. Yu. Plechov, FMMR
Type spec mass (g):13.6
Type spec location:FMMR
Main mass:Sergey Vasiliev
Comments:Submitted by Pavel Yu. Plechov, [email protected]
   and collections
FMMR: Fersman Mineralogical Museum, Leninskiy prospekt 18 korpus 2, Moscow, Russia, 119071, Russia; Website (institutional address; updated 24 Feb 2018)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Domjan Svilkovic      
Ryan Upchurch   
Public domain photographs:
Pavel Plechov   


     This is 1 of 1967 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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