Assertion: obsidian | /r/HasProperty | lapis obsidianus
Facets:
Source sentences:
text: The translation into English of Natural History by Pliny the Elder of Rome includes a few sentences about a volcanic glass called obsidian (lapis obsidianus), discovered in Ethiopia by Obsidius, a Roman explorer.
text: The translation into English of Natural History written by Pliny the Elder of Rome shows a few sentences on the subject of a volcanic glass called obsidian (lapis obsidianus), discovered in Ethiopia by Obsidius