Assertion: gypsum alabaster | /r/HasProperty | scratched with fingernail
Facets:
Source sentences:
text: The two kinds are readily distinguished by differences in their hardness: gypsum alabaster is so soft it can be scratched with a fingernail (Mohs hardness 1.5 to 2), while calcite cannot be scratched in this way (Mohs hardness 3), although it does yield to a knife.