Sayh al Uhaymir 290
Sayh al Uhaymir 290
Oman, Al Wusta district
Found 2004 Feb. 13th and Nov. 6th
Carbonaceous chondrite (CH3)
History: Sixty-four fragments were discovered within a distance of ~ 10
m by Rainer and Claudia Bartoschewitz during a natural science
expedition on a gravel plateau of Miocene fresh-water limestone of
Middle Fars group about 35 km SSW of Ghaba Resthouse (Adam County).
Physical characteristics: Sixty-four fragments weighing between 0.2 to
888 g amount to a total of 1.796 kg.
Petrography: The meteorite is mostly composed of small chondrules (<20
μm) of various textural types, ~15% fine grained metal, few small
"matrix lumps" and rare refractory inclusions.
Mineral composition and geochemistry: (R. Bartoschewitz, Bart., P. Appel
and B. Mader, Kiel, M.I. Prudêncio, ITN, U. Krähenbühl, Bern) Pyroxene
(Fs3.99-5.16Wo3.01-1.80, Al2O3 = 1.90, Cr2O3 = 0.62 [wt%]), Ti-rich
pyroxene (Fs2.88 Wo19.66, Al2O3 = 10.40, Cr2O3 = 1.27 [wt%]), olivine
(Fa1.88-0.83, CaO = 0.43 - 0.27, Al2O3 = 0.27, Cr2O3 = 0.47 [all wt%]),
sulfide (Ni = 0.4-21.7 wt%), kamacite (Ni = 3.7-8.0, Co = 0.35-0.56, Si
= 0.02-0.15, Cr = 0.08-0.40 [all wt%]), tetrataenite (Ni = 59.2, Co =
1.45 [wt%]). Whole rock siderophile, chalcophile and lithophile element
abundances similar to other CHs. Magnetic susceptibility = log χ = 5.2 x
10-9 m3/kg. Noble gas isotopes (J. Park and K. Nagao, UTokE, Japan, R.
Okazaki, KyuU) high concentrations of solar noble gases. O isotopes (M.
Kusakabe, OkaU) δ17O = 1.91‰, δ18O = 5.71‰.
Classification: Carbonaceous chondrite (CH3) moderate weathering.
This is one very rare meteorite, not much has been
made available for collectors.
