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Geothermal Energy

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Fig. 5 | Geothermal Energy

Fig. 5

From: Crystallization of calcium carbonate in a large-scale push–pull heat storage test in the Upper Jurassic carbonate aquifer

Fig. 5

Crystals on the filter from the experiments with tap water at \({T} = 45\), 60, 80 and \(110\,^{\circ }\hbox {C}\). Pictures show aragonite crystals as dominating calcium carbonate polymorph: wheat-sheaf (\(45\,^{\circ }\hbox {C}\), \(60\,^{\circ }\hbox {C}\)), spherical (\(80\,^{\circ }\hbox {C}\)), and acicular aragonite (\(110\,^{\circ }\hbox {C}\))

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