Partial chemical equilibrium plays an important role in geochemical systems. In the short turn-over time zone of hydrogeological systems, the conditions for the full chemical equilibrium amongst groundwaters, mineral phases and gases are rarely fulfilled. In these systems, partial chemical equilibrium is often responsible for controlling activity of solutes. Examples of partial chemical equilibrium with secondary phases in silicate systems of the weathered zone are given, and the role of metastable and stable secondary silicate solids is discussed.
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