"mirror glass" is a correct and usable phrase in written English.
You can use it to refer to a type of glass that has been made reflective and can be used to make mirrors. For example, "The frame of the mirror was made from a dark, glossy wood, and the back was covered with a sheet of mirror glass."
Roland Mouret also played with mirror glass, on a runway that simulated parquet flooring.
The exterior sheathing is a curtain wall of double-paned mirror glass.
He also fills frames with antiqued mirror glass and makes mirrored backsplashes and tabletops.
Dried leaves of goran trees, indigenous to the Sundarbans, have found their way onto the door made of mirror glass.
Replacement in all cases has been simple; you can typically pry off the mirror glass with a screwdriver.
Flimsy rows of concrete arches hang above swaths of blue mirror glass, punctuated by stick-on timber trellis screens.
A recent development is heat-mirror glass, in which a low-emissivity coating enhances the relative opacity of the glass to infrared radiation and slows the rate of internal heat loss in winter.
Heat-mirror glass, which has a transparent coating that admits the short-wavelength radiation from the sun but tends to reflect the longer-wavelength radiation from within occupied spaces, was introduced in 1984; when combined with double glazing, its insulating value approaches that of a wall.
All along the back of the house, broken mirror-glass lay glittering on the grass.
A corpse is covered in fragments of mirror-glass to scare away vultures.
The squat, mirror-glass office buildings by South Coast Plaza, in Costa Mesa, hard by the San Diego Freeway, look like a hundred other squat, mirror-glass office buildings scattered across greater Los Angeles.
