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Notice it does not quote the amount of CuCO3, just Cu metal. It also does not quote LOI percentage (weight loss on ignition, it will be more than 25%). Theoretical copper carbonate is 71.94% CuO (sourced by a mix of copper carbonate and carbonate hydroxide). CuO is 79.9% copper and 20.1% oxygen. Thus, we would expect Cu metal to be 57.5% (in a theoretical material). Since this example has impurities it is a little less, 55.8%.
Copper Carbonate Basic
This form of copper carbonate is the article of commerce, a mixture of theoretical copper carbonate and copper hydroxide.
In ceramics and pottery, colorants are added to glazes as metal oxides, metal-oxide-containing raw materials or as manufactured stains.