Abstract
As the basic data for differential grinding of weathered granite, the compressive strength of quartz, orthoclase and plagioclase particles was investigated in relation with the argillization of these minerals by weathering process.
Following facts were obtained:(1) Compressive strength of quartz particles shows almost the same value to that for the particles separated from the samples of the different weathering degrees.(2) Strength of strongly weathered orthoclase particles decreases to nearly a half value of the strength for less weathered ones.(3) Compressive strength of plagioclase particles decreases almost one 60 th by weathering.
