(chemistry, mining, geology, artisanship) Metastable glass of volcanic or dyke origin. / Alternative form of rocks glass (“short cylindrical liquor stoop”)

plural of glass-ceramic

A large convex lens or concave mirror that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface.

(Cockney rhyming slang) arse

A glass made to imitate agate by stacking glass layers of different colours and thickness and fusing them with heat.

Synonym of fused quartz

A type of fine-quality borosilicate glass with high resistance to shock and heat, used in science, technology, and tableware.

A type of reddish-pink transparent glass made by adding gold salts or colloidal gold to molten glass, most popular in 19th-century Britain.

A type of glass with a long stem and an open inverted cone bowl, used for serving straight-up cocktails.

Synonym of shot glass