Sedimentary rock composed primarily of the mineral dolomite CaMg CO₃ ₂. Often forms by replacement of limestone. Texture: Crystalline. Rock type: Sedimentary Chemical. Grain size: Fine to medium. Minerals present: Dolomite, Calcite minor, Quartz minor. Formation: Forms primarily by dolomitization — replacement of calcite by dolomite in magnesium-rich fluids during diagenesis. Common geological settings: Dolomite Alps Italy , Great Lakes region, worldwide; forms extensive platform sequences. Common look-alikes and related entries: Limestone, Marble, Magnesite rock.
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GeoMiner
Last updated
2026-03-30T14:38:30.976107+00:00
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Rocks — U.S. National Park Service. Authoritative overview of rock groups, the rock cycle, and geologic processes.
Sedimentary rock composed primarily of the mineral dolomite CaMg CO₃ ₂. Often forms by replacement of limestone.
How can you identify Dolostone?
Compare several properties rather than relying on colour alone. This entry records rock type: Sedimentary Chemical; texture: Crystalline; grain size: Fine to medium; common minerals: Dolomite, Calcite minor, Quartz minor. Confirm an important identification with additional field tests or qualified laboratory work.
How does Dolostone form?
Forms primarily by dolomitization — replacement of calcite by dolomite in magnesium-rich fluids during diagenesis.
Where is Dolostone commonly found?
Dolomite Alps Italy , Great Lakes region, worldwide; forms extensive platform sequences.
What is Dolostone commonly confused with?
Dolostone may be confused with Limestone, Marble, Magnesite rock. Compare multiple diagnostic properties because colour and surface appearance can overlap.
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