Explanatory notes
… concentrates. The principal ores generally classified in this heading are : (a) Atacamite, natural copper … , basic copper carbonate. (c) Bornite (or erubescite), sulphide of copper and iron. (d) Bournonite , sulphide of … of copper and arsenic (tennantite, enargite). (n) Malachite , basic copper carbonate. (o) Tenorite , cupric …