header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 8 Aug 2020
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
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
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 531 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 9 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13135 (NWA 13135)

Morocco

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:
  MB109
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2018 Apr
Mass (g):58.3
Pieces:1
Class:Ureilite
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, pplechov@gmail.com
Institutions
   and collections
FMMR: Fersman Mineralogical Museum, Leninskiy prospekt 18 korpus 2, Moscow, Russia, 119071, Russia; Website (institutional address; updated 24 Feb 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Pavel Plechov   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1502 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

Direct link to this page