Assertion: boron's form | /r/HasProperty | hard
Facets:
value: currently
type: TEMPORAL
value: the
type: DEGREE
Source sentences:
text: The metallic form is hard (9.3 on Mohs' scale) and a bad conductor in room temperatures.
text: One common form of a nanostructured material is aggregated diamond nanorods, which is harder than bulk diamond and is currently the hardest (~150 GPa) material known.
text: The metallic form is hard (9.3 on Mohs' scale) and a bad conductor in room temperatures.