The friction, wear and surface deformation in abrasion of typical very plastic non-metallic materials, AgCl and AgBr, are investigated, on emery papers at 200-500 g load. They are strikingly similar in form and magnitude to those of metals of comparable hardness. The wear rate M is related linearly to the friction coefficient μ when the emery particle diameter D is greater than 20 microns, but on finer abrasive the (M,μ) locus curves to lower μ, as for soft metals. Optical microscopic study of single abrasion grooves shows the wear to be mainly by a cutting action like that of a lathe tool, but that much plastic flow occurs; and it indicates a high adhesion component of the friction. Electron diffraction shows a backwardly tilted orientation in the abraded surface region. Its form, and its preferred azimuthal range, shows its close relation to the rolling texture and to the compression texture when extensive lateral flow is permitted. The correlation between the tilt δ of the orientation axis from the specimen normal and μ is discussed.