IRIDIUM (symbol Ir.; atomic weight 193.1), one of the metals of the platinum group, discovered in 1802 by Smithson Tennant during the examination of the residue left when platinum ores are dissolved in aqua regia; the element occurs in platinum ores in the form of alloys of platinum and iridium, and of osmium and iridium. [Please select]
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All alloys of metals having mercury are called _amalgams_. [Please select]
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It treats of the various materials and their production, ores, alloys, commercial forms, etc. [Please select]
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If we pass from the metals to their alloys, we find no confusion. [Please select]
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Iron forms, with other elements, many important combinations, such as its alloys, oxides, and sulphates. [Please select]
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_Nickel_ is important in mechanics because of its combinations with other metals as alloys. [Please select]
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