sprouts through calcareous rocks of a unique greenish color. they composition is calcite called "la calera" that is a colombian term for areas where the soil is rich in limestone. the limestone is a sedimentary rock mainly composed for calcium carbonate (caco ), usually calcite and some traces of magnesite...
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of various impurities and the remaining magnesium chloride solution concentrated by evaporation in several stages. the last stage of dehydration has to be carried out in the presence of hydrogen chloride gas to avoid hydrolysis of the magnesium chloride: a new process is under development using magnesite...