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26.16 Precious metal ores and concentrates.
The principal ores generally classified in this heading are :(a) Argentite, silver sulphide. (b) Calaverite, telluride of gold and silver. (c) Cerargyrites (or horn silver), silver chlorides and iodides. (d) Polybasite, sulphide of silver and antimony. (e) Proustite, sulphide of silver and arsenic. (f) Pyrargyrite, sulphide of silver and antimony. (g) Stephanite, sulphide of silver and antimony. (h) Gold and platinum bearing sands; the latter frequently contain other metals of the platinum group (i.e., iridium, osmium, palladium, rhodium and ruthenium).
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