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Kheneg Ljouâd
Basic information Name: Kheneg Ljouâd
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, probable fall
Year of probable fall: 2017
Country: Morocco
Mass:help 10 kg
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  LL5/6
Recommended:  LL5/6    [explanation]

This is 1 of 56 approved meteorites classified as LL5/6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 16 Oct 2017
Writeuphelp
Writeup from MB 106:

Kheneg Ljouâd        28°59’03.3"N, 8°24’38.7"W

Guelmime Es Smara, Morocco

Probable fall: 2017 July 12

Classification: Ordinary chondrite (LL5/6)

History: (H. Chennaoui Aoudjehane, FSAC) On Wednesday, 12 July 2017, around 23:13 Summer Moroccan time (GMT+1,) a bright fireball was widely seen throughout southern Morocco, traveling from the NE to the SW, with termination of the fireball southwest of Tata. The fireball lasted for several " and was followed by a series of sonic booms heard throughout southern Morocco. This event was subsequently reported on the national TV news station). The authorities of the area including soldiers reported the fireball. The fall site is in a militarized area within Morocco, but close to the border with Algeria. Military and nomads where the first to arrive at the fall site and the first piece was found within 12 hours of the fireball, on 13 July. A field mission was organized by H. Chennaoui Aoudjehane (FSAC), M. Aoudjehane, A. Bouferra and H. El Harbi on Saturday, 15 July to collect the fall information and samples for classification and the submission. The team were granted authorization to enter the militarized area, and on 16 July traveled to the fall site. The team meet several hunters with fresh, black, fusion crusted stones. The largest complete piece that they have seen was about 850 g. Coordinates for three smaller stones are a complete 15 g stone (28°59’03.3"N, 8°24’38.7"W) and two pieces totalling 22 g (28°57’28.3"N, 8°25’39.6"W), and a stone of ~1 g (28°59’55.1"N, 8°24’25.5"W). Total mass collected to date is near 10 kg.

Physical characteristics: Many fusion crusted stones ranging from <1 g to 1.2 kg. Fusion crust is matte black. Interior of the stones is largely whitish gray, with a few thin shock veins, and studded with pods (to 1 cm) and veinlets of troilite.

Petrography: (L. Garvie, ASU) Optical and SEM imaging of a polished mount shows range of chondrule types, though largely recrystallized and integrated with the matrix, the chondrules still recognizable including a large BO (to 5 mm), PO and PP. Feldspar shows a range of sizes, some grains to 200 μm, though majority <50 μm. Metal and troilite heterogeneously distributed across the mount, largest grains to 100 μm. Metal dominated by tetrataenite, with only two small (20 μm) grains of kamacite found. Metallic Cu rare, as three grains (~5 μm) found at tetrataenite/troilite boundary. Metal+troilite occupy <2 vol% of the section. Troilite single crystal with rare twin lamellae. Pentlandite, <20 μm, is rare occurring as subhedral grains within troilite. Chromite is common as large, to 200 μm, anhedral grains and small, <5 μm, subhedral and euhedral grains in feldspar. A few small melt pockets observed in the mount are consistent with shock stage S3 .

Geochemistry: (L. Garvie, ASU) Olivine Fa31.0±0.2, FeO/MnO=61.0±3.4, n=15; low Ca pyroxene Fs25.0±0.4Wo2.1±0.2, FeO/MnO=37.0±1.7, n=7; high Ca pyroxene Fs10.7Wo43.1 and Fs11.0Wo43.0; Feldspar Ab84.4±2.2An10.6±0.3Or5.0±2.3, n=4; tetrataenite (at%) Fe42.9±0.2Co2.1±0.1Ni54.9±0.2, n=4; pentlandite Fe38.6±1.0Ni13.8±1.0 Co0.6±0.6S46.9±0.3, n=5. Magnetic susceptibility (P. Rochete, CEREGE) log χ (× 10-9 m3/kg) = 3.70.

Classification: The chondrules largely integrated with the matrix are consistent with high petrologic type; the predominance of feldspars <50 μm across is consistent with type 5. Silicate mineral and metal chemistry consistent with LL, W0, S3.

Specimens: A 57 g piece partially covered by fusion crust was provided to FSAC by the Moroccan "Association des Amateurs et Collectionneurs de Météorites" for classification. 34 g at ASU.

Data from:
  MB106
  Table 0
  Line 0:
State/Prov/County:Guelmime Es Smara
Date:2017 July 12
Latitude:28°59'03.3"N
Longitude:8°24'38.7"W
Mass (g):~10000
Pieces:Many
Class:LL5/6
Shock stage:S3
Weathering grade:W0
Fayalite (mol%):31.0±0.2
Ferrosilite (mol%):25.0±0.4
Wollastonite (mol%):2.1±0.2
Magnetic suscept.:3.70
Classifier:H. Chennaoui, FSAC; L. Garvie, ASU
Type spec mass (g):57; 37
Type spec location:FSAC, ASU
Main mass:unknown
Finder:anonymous
Comments:Submitted by H. Chennaoui (FSAC)
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
FSAC: Universite Hassan II Casablanca, Faculte des Sciences Ain Chock, Departement de Géologie, BP 5366 Maârif, Casablanca, Morocco (institutional address; updated 9 Jan 2013)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2018) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. in press.
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    (Caution, these are of unknown reliability)
Denis gourgues         
Franco Vignato   
Wang Ziyao            
Woreczko Jan & Wadi            
Geography:

Morocco
Coordinates:
     Recommended::   (28° 59' 3"N, 8° 24' 39"W)

Statistics:
     This is the only approved meteorite from Guelmime Es Smara, Morocco
     This is 1 of 1321 approved meteorites from Morocco (plus 14 unapproved names) (plus 1 impact crater)
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