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effervescence

mineralogy

Learn about this topic in these articles:

calcite

  • calcite crystal structure
    In calcite: Chemical composition

    …reaction is manifested by vigorous effervescence. (The dilution of the HCl usually used is about 90:10 [water:concentrated HCl].) The reactions involved are

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carbonate minerals

  • azurite
    In mineral: Carbonates

    …are frequently identified using the effervescence test with acid. The reaction that results in the characteristic fizz, 2H+ + CO2/3→ H2O + CO2, makes use of the fact that the carbon-oxygen bonds of the CO3 groups are not quite as strong as the corresponding carbon-oxygen bonds in carbon dioxide.

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dolomite

  • Relations between lamellar twinning and cleavage planes in dolomite and calcite. This difference can be discerned best when thin sections of the minerals are viewed under a microscope.
    In dolomite: Chemical composition

    Dolomite effervesces with dilute hydrochloric acid, but slowly rather than vigorously as calcite does; in general, it appears to smolder slowly, and in some cases it does so only after the rock has been powdered or the acid warmed, or both. This difference in the character…

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