nepheline

== English == === Etymology === From Ancient Greek νεφέλη (nephélē, “cloud”), because crystals become cloudy when exposed to acid, +‎ -ine. === 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. ==== Synonyms ==== nephelite ==== Derived terms ==== ==== Translations ==== === Further reading === David Barthelmy (1997–2026), “Nepheline”, in Webmineral Mineralogy Database. “nepheline”, in Mindat.org, Keswick, Va.: Hudson Institute of Mineralogy, 2000–2026.