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Webster 1828 Edition
Nepheline
NEPHELINE
,Noun.
Definition 2024
nepheline
nepheline
See also: néphéline
English
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Nepheline
Noun
nepheline (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.