Emily Dickinson Lexicon

AM-BLYG'O-NITE, n. [Gr. αμβλυγωνιος, having an obtuse angle.]

A greenish colored mineral, of different pale shades, marked on the surface with reddish and yellowish brown spots. It occurs massive or crystalized in oblique four-sided prisms, in granite, with topaz and tourmalin, in Saxony. – Ure.