Assertion: peridot | /r/HasProperty | a 6.5 to 7
Facets:
value: on the mohs scale of hardness
type: OTHER
Source sentences:
text: Peridot is a 6.5 to 7 on the Mohs scale of hardness, so it is not the most scratch-resistant gem - compared to sapphire and ruby, at 9, or spinel at 8.