Assertion: granite's quartz | /r/HasProperty | white
Facets:
value: always
type: DEGREE
Source sentences:
text: Quartz is milky white, feldspar is white, potassium feldspar is pink, biotite is black or brown, muscovite is yellow, and amphibole is green.
text: In order for a stone to technically qualify as granite, it must contain at least 20% quartz, and quartz is always white or has a milky color to it.