The Meteoritical Bulletin, No. 103
Awlitis 001 (OA 001)
Found: 2014 Jan 15
Mass: 432.5 g
Irving and M. Aid) In January 2014 a group of eight people traveling in two
cars were returning northward after an unsuccessful meteorite hunting trip
to southern Morocco, when they stopped near Oued Awlitis to cook dinner by
the roadside. During a search for firewood, Mr. Zaid Oussaid
found a buried piece of dead tree trunk, but he could not excavate it by
hand. With the use of a pickaxe he was able to
pull the wood out of the ground, but he then noticed beside it in the
cavity a flat ellipsoidal, brownish gray rock coated by glossy translucent
crust with anastomozing wrinkle ridges. Upon returning to his home (at Dwar Ait Gazo,
30 km west of Tagounite), Mr. Oussaid
showed the 382 g specimen to Mr. Mohamed Aid, who
organized a return trip to the find site on February 21, 2014, and after a
search of the area an additional 50.5 g piece which fits exactly onto the
main stone was found about 50 m away.
Physical characteristics: (A.
and A. Irving, UWS) A very fresh
specimen (total weight 432.5 g, approximate dimensions 7.7 × 6.6 × 3.5 cm)
with a pale yellow-brown, translucent fusion crust exhibiting a darker
network of anastomozing wrinkle ridges on the surface. Small, yellow-white
components are visible through the fusion crust, and chipped parts of the
stone reveal a whitish-gray interior. A cut sample surface exhibits a
fine-grained, wavy texture of gray mineral phases in a groundmass
consisting of intergrown domains of anhedral, grayish-white minerals. Rare
rounded, up to 2 mm, white domains occur that appear homogenous, and
represent possible vesicle fills of secondary minerals.
Wittmann, WUSL; A. Irving, UWS) Crystallized,
clast-rich melt rock with a poikilitic texture of intensely fractured
olivine and pyroxene crystals that fill interstitial spaces between 5 to 50
µm, euhedral plagioclase phenocrysts. This crystallized melt groundmass
envelops partly assimilated, strongly undulous,
<1 mm plagioclase clasts that are distinguished by irregular and
sub-planar fractures in lensoid, relict domains.
In places, these plagioclase clasts contain 10 µm, euhedral domains of
silica polymorph and commonly contain planar deformation features. Up to 10
µm kamacite and taenite crystals, and up to 70 µm troilite crystals that
are in places intergrown, occur in the plagioclase clasts and in the
poikilitic groundmass. Euhedral, <10 µm grains of ilmenite and Ti-Fe
rich spinel are in some regions intergrown and contain <<1 µm domains
of FeNi metal. Small shock melt pockets occur as <0.1 mm pods, or as
<10 µm thick veins that offset the crystal fabric. Light brown,
vesicular fusion crust (up to 150 µm thick on one side of the studied thin
section and 0.5 mm thick on the other side) is composed of glass containing
sparse whisker phenocrysts. A single ~10 µm wide, irregular fracture is
filled with brown clay minerals, but no other terrestrial alteration phases
were observed in the thin section.
Wittmann, P. Carpenter and R. Korotev, WUSL; S.
Kuehner, UWS) Plagioclase phenocrysts in crystallized melt groundmass, An9597Or00.2,
n=13; plagioclase in relict clasts, An8897Or00.3,
n=18; olivine, Fa3044, molar Fe/Mn=81151, n=13; pigeonite, Fs2640Wo619,
molar Fe/Mn=4574, n=10; subcalcic augite, Fs2024Wo2534,
molar Fe/Mn=4161, n=5; spinel, (Mg0.070.11 Mn0.01 Fe2+0.870.92)
(Fe3+0.73-0.88 Al0.130.22 Si0.01-0.05
Ti0.650.8 Cr0.160.34), n=5; ilmenite, 2.1 wt% MgO,
n=2; troilite, 0.080.1 wt% Ni, n=3; kamacite, 6.87.6 wt% Ni, 0.80.9 wt%
Co, n=3; taenite, 11.524.1 wt% Ni, 0.71.2 wt% Co, n=5.
Lunar (anorthositic melt rock).
20.1 g including one polished thin section at UWB. The remaining material is held by M. Aid.