Origin of nephelineFrench néphéline from Classical Greek nephel?, cloud (see nebula) + -ine, -ine
Origin of nephelineFrom Greek nephelē cloud (because its fragments become cloudy when placed in nitric acid) ; see nebh- in Indo-European roots.
(countable and uncountable, plural nephelines)
- (mineralogy) A feldspathoid mineral of silica-poor igneous, plutonic and volcanic rocks. Chemically, nepheline is a plagioclase feldspar with insufficient silica to satisfy the chemical bonds. Because of the unfilled bonds, nepheline weathers rapidly and can only be seen as inclusions in freshly broken rock.