lntracrystalline cation order in a lunar crustal troctolite

Abstract

Lunar rock 76535 appears to be one of the most slowly cooled bits of silicate material yet studied. The crystal structures of its three major phases, anorthite, olivine, and bronzite have been refined from three-dimensional X-ray intensity data in order to characterize the well-equilibrated specimens of these minerals and to further characterize the thermal history of this rock.