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<p>[QUOTE=&quot;physics-fan3.14, post: 4856148, member: 19165&quot;]The &quot;red fiber&quot; you picture... is it actually fibrous? Or is it more of a ceramic type material? </p><p><br /></p><p>&quot;Odd&quot; materials I know that coins have been struck on: </p><p><br /></p><p>Iron (sweden)</p><p>Ivory Plastic (Keeling-Cocos)</p><p>Lead (antimony) - used by southeast asian countries in the early 20th century</p><p><br /></p><p>Some of the coolest &quot;weird metal&quot; coins are the patterns struck by Russia in Platinum in the early 1800&#039;s. At the time, Platinum was an extremely exotic material and incredibly costly to refine.[/QUOTE]</p><p><br /></p>

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