a hard, light-colored, hexagonal mineral, (Na,K)AlSiO, used in making glass, china, etc.; sodium potassium aluminum silicate
sometimes called neph′elite·
Origin of nephelineFrench néphéline ; from Classical Greek nephel?, cloud (see nebula) + -ine, -ine
A mineral of sodium-aluminum or potassium-aluminum silicate, occurring worldwide in igneous rocks and used in the manufacture of ceramics and enamels.
Origin of nephelineFrom Greek nephel&emacron;, 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.