Hapkeite is a mineral discovered in the Dhofar 280meteorite found in 2000 in Oman on the Arabian peninsula. The meteorite is believed to originate from the Moon; specifically, it appears to be a fragment of lunar highland breccia. Hapkeite's composition is of silicon and iron, and it is similar to other silicon-iron minerals found on Earth. An impact on the Moon is thought to have launched the partially molten or vaporized material into orbit.
Due to its 1:2 composition of silicon-iron, hapkeite was given the chemical formulaFe2Si. It occurs as opaque, yellowish to silvery microscopic isometric crystals.