Abstract

Phosphatization of volcanic flows exposed in a cliff face north of Minas, Uruguay, is attributed to surface and near-surface action of solutions derived from guano. The phosphatic rock is found mainly in fissures and caves in the lower part of the cliff and in the talus below it. The deposit has little commercial significance in view of the fact that most of the phosphate occurs in combination with aluminum and iron as variscite and strengite.

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