Assertion: mineral's crystal | /r/CapableOf | taper to pyramid
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: Diagnostic Properties Hardness, high specific gravity, hexagonal crystals sometimes tapering to a pyramid, parting, luster, conchoidal fracture Chemical Composition Al 2 O 3
text: Diagnostic Properties Hardness, high specific gravity, hexagonal crystals sometimes tapering to a pyramid, parting, luster, conchoidal fracture Chemical Composition Al 2 O 3