Assertion: crystalline boron | /r/HasAspect | a density of 2.3 g/mc3
Facets:
Source sentences:
text: Pure crystalline boron has a density of 2.3 g/mc3, a melting point of 2075° C, and a boiling point of 3860° C; its hardness on the mineralogical scale is 9, and its microhardness is 34 giganewtons per sq m (3,400 kg-force per sq mm).