Assertion: granite's mineral | /r/HasProperty | biotite
Facets:
value: ordinarily
type: DEGREE
Source sentences:
text: Other minerals are biotite or muscovite (between 5% and 15%), and amphiboles.
text: If neither feldspar is in great excess, neither amphibole nor pyroxene is likely to be an essential constituent; the other minerals will then ordinarily be either biotite or muscovite, or both.