Origin of nepheline
Examples from the Web for nepheline
Some writers held that this mineral has resulted from the decomposition of nepheline; others regard it as a primary mineral.
When leucite or nepheline replaces plagioclase, the rock becomes a leucite-basalt, or nepheline-basalt.Volcanoes: Past and Present|Edward Hull
These last consist of an intermixture of nepheline or sodalite and alkali-felspar.
The pyroxene is morphic, yellow or green, and is surrounded by formless areas of nepheline.
Nepheline appears to decrease in amount as leucite increases.