plural of nepheline

(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.

(geology) relating to, or composed of nepheline

(geology) To convert into a nepheline

simple past tense and past participle of nephelinize

(geology) Converted to a nepheline