|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: 6 kg
This is 1 of 445 approved meteorites classified as CM2. [show all]
Search for other: Carbonaceous chondrites (type 2), CM-CO clan chondrites, CM chondrites, and Carbonaceous chondrites
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
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 Farmer. Other collection masses include: Farmer 2.6 kg, Labenne 1.6 kg, T. Jakobowski 512 g, G. Fujihara 358 g, M. Ouzillou 173 g.
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, 61 Rue Buffon, LMCM-CP52, 75005 Paris, France, France; Website (institutional address; updated 8 Nov 2012)
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)
Farmer: 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|
This is 1 of 70 approved meteorites from Saguia el Hamra, Western Sahara
This is 1 of 143 approved meteorites from Western Sahara (plus 18 unapproved names)
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