Glassy /(?)/

Glass·y

Glassy

a.
  1. Made of glass; vitreous; as, a glassy substance.
  2. Resembling glass in its properties, as in smoothness, brittleness, or transparency; as, a glassy stream; a glassy surface; the glassy deep.
  3. Dull; wanting life or fire; lackluster; -- said of the eyes.

Phrases & Compounds
Glassy feldspar
a variety of orthoclase; sanidine.