the world > the earth > minerals > types of mineral > silicates > nesosilicates > [noun] > subsaturate group > topaz (5)
A golden-yellow precious stone, esp. topaz. Now chiefly historical.
An off-white to lemon yellow variety of topaz occurring in columnar aggregations.
= pyrophysalite n. at pyro-, comb._form affix 2.
The name given (with or without distinguishing adjunct) to several highly valued precious stones. In modern use (trueor occidental topaz), a…