These feature a high surface area coated with platinum, palladium ... a figure of 6.7 g per ton of his fine-sifted roadside dirt “ore”, a figure which as he points out would be considered ...
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Rhodium: Earth's Rarest and Most Expensive Precious MetalOn Christmas Eve in 1800, English scientist William Hyde Wollaston a piece of nearly pure platinum ore, secretly purchased and smuggled from the Spanish colony of Nueva Granada (Colombia ...
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