Garnet: First Occurrence in the Lunar Rocks

Abstract
Three grains of almandine-rich garnet isolated from lunar sample 12021 have the composition Alm 70.7 Gro 25.0 Sp 2.7 Pyr 1.6 , with cell edge of 11.624 angstroms and refractive index of 1.81. The garnet probably formed late in the crystallization sequence.