Florida Geological Survey -
Geologic Topics
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Identification: Dolostone is a sedimentary rock composed
principally of the mineral dolomite CaMg(CO3)3
. The mineral has a white, light brown or pink color,
with a white streak. The test for dolostone is the
same as that for calcite,
except that dolostone effervesces very slowly in cold dilute
hydrochloric acid, and more vigorously in warm acid.
Occurrence: Dolostone is usually found closely associated with limestone deposits.
Use: Dolostone can be used for most of the same purposes as limestone except
for making Portland cement, because in this process the
magnesium (Mg) interferes with the setting properties of the
cement .
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