11 letters · 19 points in Scrabble
noun a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium
originFrom Ancient Greek ἀμβλύς (amblús, “blunt, dull”) + γωνία (gōnía, “angle, corner”) + -ite. By surface analysis, ambly- + -gon + -ite.
Etymology from Wiktionary, CC BY-SA 3.0