Computer Science
Scientific paper
Nov 1958
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958gecoa..15...57c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 15, Issue 1-2, pp.57-72
Computer Science
4
Scientific paper
Petrographic studies have shown that many gypsum deposits have been formed by the hydration of anhydrite, but the mechanism for hydration has not been fully explained. Gypsum has been produced experimentally by the agitation of anhydrite in pure water, a reaction that is accelerated by certain acids, bases, and salts, particularly alkali sulphates. Phase investigations and reaction velocity studies indicate that accelerated hydration of anhydrite takes place through the medium of transient surface complexes in dilute solution. Concentrated solutions may precipitate double salts. Contrary to recent hypotheses of gypsum dehydration by concentrated salt solutions, double salts and/or gypsum are stable phases below a temperature of 42°C. Above 42°C double salts may replace anhydrite as the stable phase. Gypsum, however, may remain a metastable phase indefinitely in its saturated solution below the hemihydrate transition temperature (98°C). Experimental data indicate that precipitation of anhydrite from sea water is unlikely.
Bundy W. M.
Conley R. F.
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