Assertion: basalt | /r/HasProperty | less than 10% feldspathoid
Facets:
value: by definition
type: OTHER
value: by volume
type: OTHER
Source sentences:
text: By definition, basalt is an aphanitic (fine-grained) igneous rock with generally 45–53% silica (SiO 2 ) and less than 10% feldspathoid by volume, and where at least 65% of the rock is feldspar in the form of plagioclase.