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An easy test is to try to dissolve it with hydrochloric acid. Dolomite shows a much weaker reaction with acids than calcite.

If this test is not conclusive one can add quinalizarin to the acid. In the case of dolomite the solution will then become blue because of a complex forming with the magnesium from the dolomite. In the case of calcite this blue colour should be either absent or very weak because calcite commonly contains only little magnesium.

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What type of mineral is colorless cannot be scratched by calcite has no shine and breaks apart in many ways?

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