Assertion: opal | /r/CapableOf | rank on the mohs scale of hardness
Facets:
Source sentences:
text: Opal ranks 5-6.5 on the Mohs scale of hardness, making this gem best suited for jewelry like earrings, pendants and brooches that rarely encounter impacts.
text: Opal ranks 5-6.5 on the Mohs scale of hardness, making this gem best suited for jewelry like earrings, pendants and brooches that rarely encounter impacts.