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The chemical durability of quartz, fused silica, obsidi~n , flint , op.aI , and. glass were determined by the interferometer met hod and t he re~u.lts m terpreted III the lIght of t J:e Donnan theory of membrane equilibria. A more sensitive t est of the ~am~ phenomena IS t he uneven distribution of migratable ions, as shown by. t he Ag+Brtltr,!,~lOn . The tests used are sensitive eno ugh to differentiate between t he dlffere?t. types of sIlIca. and ~ay be applicable to t he study of the chemica.l weathering characterIstICs of all natural silicates. Results of preliminary experime.J?ts on enamels and m~tals show tha~ t hese tests may. s~rve as indicators of the corrosive r esistance of t hese materIals under a wide range of conditIOns

An interferometer procedure applied to the study of the chemical durability of silicates, enamels, and metals