The word "glassy" means something that looks or feels like glass. It can describe a surface or object that is smooth, shiny, and reflective, similar to glass. Full definition
Surfing conditions were clean and glassy with just a light NNE wind @ 1 - 2knot. (baliwaves.com)
The direction is also fairly by the book with shots of glassy eyes stares and Tatum's inhumanly perfect body in equal measure, but the shoe fits. (trespassmag.com)
She steps into a beam of sunlight under a skylight, surveying the space with glassy eyes, as in disbelief. (latimes.com)