Not much dolomite is observed to be precipitating from solution in modern geologic environments. This probably means that:
a. the conditions were more conducive to precipitation of dolomite in the geologic past
b. dolomite must have formed from calcite after deposition by the replacement of calcium by magnesium in the mineral structure
c. dolomite is probably forming today, but we haven't located the environments where it is taking place
d. dolomite must have formed from gypsum after deposition by the replacement of calcium by magnesium in the mineral structure
b
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