From Wikipedia, the free encyclopedia
Lapis obsidianus[1] sive lapis obsianus[2] vel achates Islandicus[3] est vitrum vulcanicum, quod ex lava rapide refrigescenda ortum est. Apud Plinium, nomen a quodam "Obsio" sive "Obsidio" trahit, qui primus lapidem in quaedam Aethiopiae regione invenerit:
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