Abstract
The effect of magnesium and fluoride ions on the precipitation of calcium carbonates and phosphates was studied under conditions favouring a slow spontaneous precipitation. Magnesium ions stabilized the amorphous precipitates of calcium carbonate phosphate and disturbed the crystallization of the apatite. Apatitic precipitates were more poorly-crystallized when formed in the presence of magnesium ions than when formed in their absence. At very low phosphate concentrations magnesium ions enabled the precipitation of large amounts of aragonite beside the calcite. Fluoride ions slightly improved the crystallinity of the precipitated calcium phosphates and decreased their solubility.
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