ArticlesSpecial Mineral Studies

Lunar Soil: Size Distribution and Mineralogical Constituents

Science  30 Jan 1970:
Vol. 167, Issue 3918, pp. 648-650
DOI: 10.1126/science.167.3918.648


The lunar soil collected by Apollo 11 consists primarily of submillimeter material and is finer in grain size than soil previously recorded photographically by Surveyor experiments. The main constituents are fine-grained to glassy rocks of basaltic affinity and coherent breccia of undetermined origin. Dark glass, containing abundant nickel-iron spheres, coats many rocks, mineral, and breccia fragments. Several types of homogeneous glass occur as fragments and spheres. Colorless spheres, probably an exotic component, are abundant in the fraction finer than 20 microns.