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Natural colorless calcite crystals are colored electrolytically by using a pointed cathode and a flat anode at various temperatures and voltages. Ca +  and CO 3  −  color centers, Ca 2+  vacancies, and CO 3  2-  units are produced in colored crystals. Absorption spectral bands of the Ca +  and CO 3  −  color centers, Ca 2+  vacancies, and CO 3  2-  units are reported for the colored crystals at room temperature. Pb 2+  spectral bands are observed in absorption and fluorescence spectra of uncolored and colored crystals. The currenttime curve for electrolytic coloration of natural calcite crystal and its interpretation with respect to the electrolytic coloration process are given. Creation and conversion of color centers are explained.

Electrolytic coloration and spectral properties of natural calcite crystals