Assertion: alkali basalt | /r/HasProperty | characterized by nepheline
Facets:
value: in its cipw norm
type: OTHER
Source sentences:
text: Alkali basalt is characterized by relatively high alkali (Na 2 O and K 2 O) content relative to other basalts and by the presence of olivine and titanium-rich augite in its groundmass and phenocrysts, and nepheline in its CIPW norm.