Detrital grains of gypsum are not likely to be concentrated in placer deposits.
Placer deposits are naturally occurring concentrations of heavy minerals brought about by the gravitational pull of moving particles. When weathering processes liberate heavy, stable minerals from their matrix, they are gradually carried into streams that quickly winnow the lighter matrix.
Within evaporite sequences and in conjunction with limestones and shales, gypsum is frequently found in significant thicknesses. At the bottom of numerous large-scale tectonic dislocations and thrust faults, substantial quantities of alabaster gypsum are frequently found. In order to make cement and plaster for the construction industry, gypsum is a crucial raw material.
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