Assertion: onyx's band | /r/CapableOf | induce mental heaviness
Facets:
Source sentences:
text: In the ancient world, Onyx was considered a “gem of Saturn,” not for embodying metallic lead of which he was the deity and symbol, but because of the gloomy blackness of Onyx’s broad bands that were reputed to induce mental heaviness, stupor, and despondency (symptoms of chronic lead poisoning).