I find boulder-sized dolomite at the beach in a variety of gorgeous colors. Like limestone, dolomite rock can also exhibit fossils, but not as commonly. Limestone and dolomite rock also share the same color ranges: white to light gray, yellowish, green, pinkish, purplish, and even black are possible. It is widespread in the Cambrian Period throughout the world. Limestone is strongly effervescent in acid, while dolomite reacts very weakly.Īs with limestone, dolomite rock originates in warm, shallow marine environments where calcium carbonate accumulates from shell, algae, or coral fragments. The two types are often indistinguishable in the field so geologists usually carry diluted hydrochloric acid to test the rocks. Dolomite rock is a sedimentary rock derived from limestone with a high percentage of the mineral dolomite. The problem is that dolomite is both a mineral and a rock type. There is considerable confusion about the name of this rock.
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