Assertion: chalcedony | /r/HasAspect | a hardness of approximately 7
Facets:
value: on the mohs hardness scale
type: OTHER
value: on the
type: LOCATION
Source sentences:
text: Chalcedony has a hardness of approximately 7 on the
text: Chalcedony has a hardness of approximately 7 on the Mohs hardness scale Chalcedony breaks with a conchoidal fracture, meaning its broken pieces often have smooth, curved surfaces.