What Is
Dolomite?
Dolomite forms when limestone is altered by magnesium-rich groundwater — the calcium in the limestone is partially replaced by magnesium, creating the mineral dolomite. The resulting rock is similar to limestone in many ways but slightly harder and less reactive to acids — though still significantly reactive compared to silica-based stones. It occupies a middle ground between limestone and quartzite in terms of hardness and acid resistance.
Dolomite is frequently mistaken for marble — it can have beautiful white and grey tones with subtle veining that resembles Carrara marble. It is often marketed under trade names that sound like marble varieties. The visual similarity is strong enough that the distinction is important: if you think you have marble but actually have dolomite, the care approach is the same — but the expectations should be calibrated accordingly.
