Assertion: chalcedony | /r/HasProperty | hard and very durable material
Facets:
value: very
type: DEGREE
value: relatively
type: DEGREE
Source sentences:
text: Chalcedony is a very hard and very durable material.
text: Because chalcedony is relatively hard, it makes a great choice for durable jewelry.
text: With its colorful appearance, ability to accept a bright polish, durablity to survive the tumbler, ready availability and low price, chalcedony is the perfect material for making Chalcedony is a very hard and very durable material.