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Rhodium.


Cost: about $ 58 per gram. Rhodium is mainly used in catalytic converters to reduce the carbon emissions of the car. This metal does not play any biological role. Rhodium compounds rarely encountered in everyday life and their effects on the human body are not fully understood. Despite this, they are highly toxic and carcinogenic substances. Rhodium salts can strongly stain human skin.
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 Platinum.  Gold.