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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2012 State of Florida