Assertion: boron | /r/HasProperty | the second hardest element
Facets:
value: in its diamond form
type: OTHER
value: in the world
type: LOCATION
value: behind carbon
type: OTHER
value: according to chemicool
type: OTHER
value: on earth
type: LOCATION
Source sentences:
text: It is chemically unreactive and is the second hardest element on earth.
text: Boron, in its crystalline form, is the second-hardest element behind carbon (in its diamond form), according to Chemicool.
text: Boron is a hard metal and is considered the second hardest element in the world.