Assertion: granite's rock | /r/MadeOf | 10 to 50 percent quartz
Facets:
value: scientifically
type: MANNER
Source sentences:
text: Any rock that contains 10 to 50 percent quartz and offers an alkali-to-feldspar ratio between 65 and 95 percent is defined as granite.
text: Scientifically, an intrusive (plutonic) igneous rock must contain between 10% and 50% quartz to be classified as granite, but other similar stones such as gabbro, diabase, anorthosite, sodalite, gneiss, and basalt are sometimes sold as “granite” commercially.