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Calcite crystals have been obtained from supersaturated solutions diffusing both in agarose and Na-metasilicate gels. Crystal morphology in agarose is characterized mainly by spherulites grown around solid gel impurities and terminated by the cleavage {1014} rhombohedron. Grown from Na-metasilicate gel, {1014} and {0112} rhombohedra compete according to the influence of pH and of the acidifying agent,...
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