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Jbilet Winselwan
Basic information Name: Jbilet Winselwan
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2013
Country: Western Sahara
Mass:help 6 kg
Meteoritical Bulletin:  MB 102  (2013)  CM2
Recommended:  CM2    [explanation]

This is 1 of 637 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 21 Aug 2013
Revised 19 Dec 2015: Corrected shock stage
Writeup from MB 102:

Jbilet Winselwan        26°40.044’N, 11°40.637’W

Morocco/Western Sahara

Found: 24 May 2013

Classification: Carbonaceous chondrite (CM2)

History: (H. Chennaoui Aoudjehane, M. Aoudjehane, A. Laroussi, A. Bouferra) In early June 2013, A. Bouferra, a meteorite hunter from Smara, reported a new carbonaceous chondrite that had been found close to Smara. Due to its proximity to Smara (7 km), many meteorite hunters visited the area in the summer of 2013.

Physical characteristics: Total mass is estimated about 6 kg, with small and complete pieces between 3 and 10 g, a few medium-sized pieces 10 to 200 g and rare big pieces >200 g. The largest sample is ~900 g. Fresh looking fusion is crust present on many fragments. Some fragments are wind ablated. Some cracks contain secondary, crystalline alteration products. Interior of stones is black and peppered with chondrules.

Petrography: (R. Hewins, MNHNP, L Garvie, ASU). The meteorite contains chondrules and fragments of Types I and II. These include BO-PO, formerly metal-rich, and olivine-pyroxene Type I chondrules. Type II chondrules with forsterite relict grains are present. There are regions packed with chondrule material and coarse PCP, and zones with scattered chondrule material in fine-grained matrix. Chondrule sizes range up to 1.2 mm, though most are around 200 μm. A few CAIs are 800 μm. Powder x-ray diffraction shows a strong 0.7 nm peak for serpentines, a broad but weaker peak around 1.3 nm corresponding to smectites, and a weak broad peak consistent with tochilinite.

Geochemistry: (R. Hewins, MNHNP) Olivine is Fa0.98±0.44 and Fa25-40. Pyroxene is Fs2.6±1.5 and Fs40-61. Rare kamacite with 5.8 wt% Ni is present. (P. Cartigny, IPGP) The oxygen isotopic compositions of two pieces were determined as δ18O 3.811±0.09 and 5.851±0.016, δ17O -2.446±0.040 and -0.601±0.026, respectively. Δ17O values are -4.441 and -3.663, mean -4.052.

Classification: The oxygen isotope compositions, petrography and mineral compositions are all consistent with CM2

Specimens: 17.8 g MNHNP, 17.4 g FSAC provided by L. Labenne, 20 g UNM provided by G. Fujihara, 122 g ASU provided by MFarmer. Other collection masses include: MFarmer 2.6 kg, Labenne 1.6 kg, T. Jakobowski 512 g, G. Fujihara 358 g, M. Ouzillou 173 g.

Data from:
  Table 0
  Line 0:
State/Prov/County:Saguia el Hamra
Date:24 May 2013
Mass (g):about 6000
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):0.98±0.44 and 25-40
Ferrosilite (mol%):2.6±1.5 and 40-61
Wollastonite (mol%):1.1±0.1
Magnetic suscept.:4.05-4.15
Classifier:B. Zanda, R. Hewins, MNHNP; H. Chennaoui Aoudjehane, FSAC
Type spec mass (g):177 g total
Type spec location:MNHNP, FSAC, ASU
Main mass:See text
Finder:H. Chennaoui Aoudjehane, M. Aoudjehane, A. Laroussi, A. Bouferra
Comments:Submitted by H. Chennaoui Aoudjehane
Plots: O isotopes:  
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
FSAC: Universite Hassan II Casablanca, Faculte des Sciences Ain Chock, Departement de Géologie, BP 5366 Maârif, Casablanca, Morocco (institutional address; updated 9 Jan 2013)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
IPGP: Institute de Physique du Globe de Paris, 1 rue Jussieu, 75252 Paris, Cedex 05, France (institutional address; updated 3 Nov 2014)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Western Sahara
     Recommended::   (26° 40' 3"N, 11° 40' 38"W)

     This is 1 of 117 approved meteorites from Saguia el Hamra, Western Sahara (plus 1 unapproved name)
     This is 1 of 280 approved meteorites from Western Sahara (plus 20 unapproved names)
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