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a-Axis a-Axis/a-Axis adhesion force adhesion magnitude air-formed surfaces Albite Andesine anisotropic atomic bonding forces Bytownite charge and coordination cleavage plane cleavage the upper cleavage was performed coordination demands crystalline orientation data obtained dispersion forces displacement double cleavage forepump formed in air fresh surface gas bursts Hg ra-e Hg range Hg was observed hornblende hypersthene indications of adhesion ion pump Labradorite 001 load dependence load force long range attractive long range force lower sample lunar material lunar surface magnesium material transfer measurement of adhesion mechanical metal minutes after cleavage nitrogen occurred Orthoclase 001 oxygen Plane Cleavage pressure burst produced range attractive force samples were brought shown in Figure silicate adhesion silicate atomic bonding silicate surfaces single cleavage soil solar wind Sorption strong long range surface charging surface contamination surface damage surface roughness system pressure Tektite temperature tetrahedra Type B behavior ultrahigh vacuum upper sample rotated x 10 dynes