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Rhodium is a hard, silvery, durable metal that has a high reflectance. Rhodium metal does not normally form an oxide, even when heated. [25] Oxygen is absorbed from the atmosphere only at the melting point of rhodium, but is released on solidification. [26] Rhodium has both a higher melting point and lower density than platinum.
Bowieite is a rhodium-iridium-platinum sulfide mineral (Rh,Ir,Pt) 2 S 3, found in platinum-alloy nuggets from Goodnews Bay, Alaska. [2] [3] [1] It was named (by the IMA in 1984) after the British scientist Stanley Bowie (1917–2008), in recognition of his work on identification of opaque minerals.
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Some jewellery is plated to give it a shiny, reflective look or to achieve a desired colour. Sterling silver jewellery may be plated with a thin layer of 0.999 fine silver (a process known as flashing) or plated with rhodium or gold. Base metal costume jewellery may also be plated with silver, gold, or rhodium for a more attractive finish.
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A silver object that is to be sold commercially is, in most countries, stamped with one or more silver hallmarks indicating the purity of the silver, the mark of the manufacturer or silversmith, and other (optional) markings to indicate the date of manufacture and additional information about the piece.
Speidel experienced a boom in popularity, notably with their invention of the hugely popular expanding strap in the mid-1930s, and in addition to watchbands Speidel produced wristwatches, lighters, writing instruments, small jewelry, and other accessories, before beginning to decline by the end of the century with the struggle to compete with ...