Sayh al Uhamir is a meteorite found in the Sayh al Uhaymir region of Oman, originating from the Moon. It collided with the Earth 
.
It is complete, a light gray-greenish rounded stone, dimensions 70x43x40mm and mass 206 grams.
According to geologist Edwin Gnos and coworkers, the meteorite's origin can be pinpointed to the Laldande Impact Crater ; isotopic analysis shows a complex history of four distinct lunar impacts:
"Crystallization of the impact melt occurred at 3909 ± 13 Ma, followed by exhumation by a second impact at 2800 Ma, which raised the sample to a regolith position at unconstrained depth. A third impact at 200 Ma moved the material closer to the lunar surface, where it mixed with solar-wind–containing regolith. It was launched into space by a fourth impact at <0.34 Ma" (Science 2004, vol 305, pp657-9, July 2004).
External link
http://epsc.wustl.edu/admin/resources/meteorites/sau169.html