Copper Carbonate (CuCo3) - May yield green & turquoise in oxidation or red in reduction with a slight fluxing reaction. Copper glazes may tend to volitize at higher temperatures & affect the color of the pieces around them. Carbonate form is more toxic than the oxide.
Conceptually, copper carbonate is CuCO3, however this form is not normally available in the market (copper carbonate basic is the article of commerce) so the powder should be viewed as a family of compounds.
CAS#12069-69, 10214-40-1, 7440-50-8