Abstract
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 {1 0 1 ̄ 4} rhombohedron. Grown from Na-metasilicate gel, {1 0 1 ̄ 4} and {0 1 1 ̄ 2} rhombohedra compete according to the influence of pH and of the acidifying agent, HCl or CH 3COOH, the latter favouring the appearance of the {0 1 1 ̄ 2} form.
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