Assertion: granite's rock | /r/MadeOf | feldspar
Facets:
value: mainly
type: DEGREE
Source sentences:
text: These rocks mainly consist of feldspar, quartz, mica, and amphibole minerals, which form an interlocking, somewhat equigranular matrix of feldspar and quartz with scattered darker biotite mica and amphibole (often hornblende) peppering the lighter color minerals.