... powder. It is a naturally occuring mineral (known as Otavite). Cadmium CarbonateCadmium Carbonate is a white, odorless crystal or powder. It ... = 1)Solubility in H2O : Insoluble, soluble in acids, KCN,NH, salts.Appearance and Odor : White, amorphous powder, no odor. Cadmium Carbonate