The Azraq depression (El-Qa’) in the north of Jordan covers an area of ~12,710 km2 and is 110 km east of Amman. An exploration programme has revealed, via numerous boreholes, the presence of deposits of diatomaceous earths over an area of 150 km2, together with smectitic clays and palygorskite. Indicated reserves for the two identified diatomaceous horizons, assuming a dry density of 0.7, are >1250 million tonnes. The chemical and physical properties of these deposits are reported in detail, and their industrial uses are evaluated. Numerous SEM images are included, showing the diatom frustules; these are composed...

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