Here is an interesting one.
This mineral is also called ebonite.
It’s a hard, moldable polished dark color of brown or black. This was early rubber. Vulcanite was produced by adding Sulphur to
vulcanized rubber. It was used for combs,
ornaments and buttons.
Vulcanite - pic courtesy of Wikipedia
Hard rubber fountain pin bodies, hockey pucks, battery cases
and mouthpieces for clarinet and saxophone are other uses for vulcanite.
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