The heptahydrate of sodium sulfate: Does it have a role in terrestrial and planetary geochemistry?

Details The heptahydrate of sodium sulfate: Does it have a role in terrestrial and planetary geochemistry? The heptahydrate of sodium sulfate: Does it have a role in terrestrial and planetary geochemistry?

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008icar..198..277h&link_type=abstract

Icarus, Volume 198, Issue 1, p. 277-279.

Physics

8

Scientific paper

Sodium sulfate readily forms a metastable heptahydrate from concentrated aqueous solutions on cooling to around 10 °C. It crystallises much more easily than the well recognised and less soluble decahydrate (mirabilite), although the existence of the heptahydrate is almost entirely ignored in the geochemical literature on sodium sulfate. There is strong evidence that the heptahydrate is stable below a triple point temperature of -9.5 °C at low water vapour pressures, conditions which are found in cold dry environments such as the surface of Mars and the icy moons of Jupiter.

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