Obsidian

Posted by Eran Cohen.
First posted on 01 March 2012. Last updated on 01 March 2012.
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History recorded that, sometime during the Roman era, a man returning from the Ethiopian highlands brought back with him a piece of black, shiny volcanic glass. According to the Roman historian Pliny the Elder, the man's name was Obsius, and the mineraloid he found was named after him—Obsius Lapis or Stone of Obsius or Obsian for short.

Aside from Pliny's reference, little else was known about…

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