Topaz

noun
1.
a mineral, a fluosilicate of aluminum, usually occurring in prismatic orthorhombic crystals of various colors, and used as a gem.
2.
citrine (def 2).
3.
either of two South American hummingbirds, Topaza pella or T. pyra, having chiefly red and crimson plumage and a yellowish-green throat with a topaz sheen.
noun
1.
a white or colourless mineral often tinted by impurities, found in cavities in igneous rocks and in quartz veins. It is used as a gemstone. Composition: hydrated aluminium silicate. Formula: Al2SiO4(F,OH)2. Crystal structure: orthorhombic
2.
oriental topaz, a yellowish-brown variety of sapphire
3.
false topaz, another name for citrine
4.

a yellowish-brown colour, as in some varieties of topaz
(as adjective): topaz eyes

5.
either of two South American hummingbirds, Topaza pyra and T. pella
topaz
(tō’pāz’)

A colorless, blue, yellow, brown, or pink orthorhombic mineral valued as a gem. Topaz occurs as transparent or translucent prisms in silica-rich igneous rocks, such as pegmatite, and in tin-bearing rock veins. Chemical formula: Al2SiO4(F,OH)2.

Any of various yellow gemstones, especially a yellow variety of sapphire or corundum.

Heb. pitdah (Ezek. 28:13; Rev. 21:20), a golden yellow or “green” stone brought from Cush or Ethiopia (Job 28:19). It was the second stone in the first row in the breastplate of the high priest, and had the name of Simeon inscribed on it (Ex. 28:17). It is probably the chrysolite of the moderns.