Assertion: calcite's cleavage | /r/CapableOf | meet at nearly 90° hardness
Facets:
value: harder than glass
type: OTHER
Source sentences:
text: Cleavage One perfect cleavage and one good cleavage that meet at nearly 90° Hardness 6 (harder than glass)
text: Cleavage One perfect cleavage and one good cleavage that meet at nearly 90° Hardness 6 to 6.5 (harder than glass)