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pallasite(pal -ă-sÿt) See stony-iron meteorite.
a rare stony-iron meteorite, named after the first extant meteorite of this type, Pallas iron, discovered in Siberia by the schoolteacher Medvedev and brought to St. Petersburg on the instructions of P. S. Pallas in 1772. Pallasites are composed of approximately equal quantities of nickel iron and olivine. The unique pallasite structure indicates that these meteorites were formed during the absence of gravitational force, or at least of significant gravitational force.