Explanatory notes
… 26.03 ‑ C opper ores and concentrates. The principal ores generally classified in this heading are : … (b) Azurite , basic copper carbonate. (c) Bornite (or erubescite), sulphide of copper and iron. (d) Bournonite , … antimony. (e) Brochantite , basic copper sulphate. (f) Chalcocite , copper sulphide. (g) Chalcopyrite (copper …