Zeolite content and cation exchange capacity of zeolite-rich rocks

The zeolite fraction of zeolite-rich rocks of different occurrence was calculated using quantitative phase analysis by combined Rietveld and Reference Intensity Ratio (RIR) methods and cation exchange capacity (CEC) by NH, solution. The cross-check results are in good agreement apart from a clinoptilolite-rich sample whose zeolite content from CEC was significantly underestimated.