A portion of the system Na 3 PO 4 -CaCO 3 -H 2 O was investigated at low temperatures. The formation of a carbonate apatite by phosphate replacement of calcite in alkaline solutions and the structural positions of the carbonate groups are discussed. Data indicate calcite replacement by low concentrations of phosphate to be the principal mechanism of formation of marine phosphorite deposits.

First Page Preview

First page PDF preview
You do not currently have access to this article.