'Helvite' definitions:

Definition of 'Helvite'

From: GCIDE

Helvine \Hel"vine\, Helvite \Hel"vite\, n. [L. helvus of a light bay color.] (Min.) A mineral of a yellowish color, consisting chiefly of silica, glucina, manganese, and iron, with a little sulphur. [1913 Webster]