9 letters · 14 points in Scrabble
noun a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels
originFrom Ancient Greek νεφέλη (nephélē, “cloud”), because crystals become cloudy when exposed to acid, + -ine.
Etymology from Wiktionary, CC BY-SA 3.0