Description:
A fireball was witnessed in the area, but no
records of the direction of movement were recorded. A
single stone of 3165 g was found by A. Salem El Moichine,
a local resident, on the same day at 13:00 hr local time,
11 km SE of Bassikounou. Numerous other finds define an 8
km long strewnfield. The 3165 g specimen is largely
covered by black fusion crust. The interior is light
gray. On the surface of the fusion crust there is some
adherent soil material, some of which is bright red.
Petrography: (E. Gnos, MHNGE; B. Hofmann, NMBE,
M. Eggimann, Bern/NMBE): Mean chondrule size
0.35 mm (n=53). Metal abundance is 8 vol%, troilite 6.6
vol%. Mean plagioclase grain size is ~20 mm. Troilite is
polycrystalline, rich in silicate inclusions, and shows
diffuse boundaries to metal. Metal is partly rich in
silicate- and troilite inclusions. Rare metallic Cu (10
mm) occurs at kamacite-taenite boundaries and in
troilite. Some shock veins and no weathering products
were observed. Mineral compositions: Olivine (Fa18.6),
pyroxene (Fs16.3 Wo1.1),
plagioclase (An13.7). Cosmogenic
radionuclides: (P. Weber, PPGUN)
Gamma-spectroscopy performed in December-January 2006
showed the presence of the following radionuclides: 48V,
46Sc, 56Co, 54Mn, 58Co,
7Be, 51Cr, 57Co, 22Na,
26Al and 60Co. Recalculated to 12 October 2006
22Na was 38.0±2.2 and 26Al 31.5±2.1 (both
dpm/kg), the activity ratio of 1.21 is fully consistent
with a fall on that date. Shock stage: S2, weathering
grade W0. (From
Meteoritical Bulletin 92)
# BAS3-2
# BAS6-3
# BAS9-2
# BAS11-4
ABOUT SCALE
Each photo has a small cube one centimeter on a side. The
photo above gives you an idea how big it is. The ruler is
in inches at the top. The coin is a US dime. If you are
interested in a specimen, I will be happy to send you the
dimensions or a photo with different scale.