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). 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.