a. Any ultramafic rock, whether of meteoric or terrestrial origin, that
contains approx. 60% iron if meteoric, or more iron oxides than silica if
terrestrial. AGI
b. A stony-iron meteorite composed essentially of large single glassy
crystals of olivine embedded in a network of nickel-iron. Pallasites are
believed to have been formed at the interface of the stony mantle and
metal core of a layered planetoid. Syn: pallas iron
Source:
Dictionary of Mining, Mineral, and Related Terms