Assertion: magma's amount | /r/HasProperty | oforthoclase
Facets:
Source sentences:
text: Groundmass generally of quartz and plagioclase, with lesser amounts oforthoclase, biotite, amphibole ( augite), pyroxene ( hornblende), and glass; phenocrysts of plagioclase and quartz, often with amphibole and / or biotite, sometimes orthoclase.