Imperial Topaz

Chemical Formula

AL2SiO4(OH,F)2

Chemical Class

Silicates

Properties

Imperial topaz is topaz most rare variety. This variety found in Russia is a ‘precious stone’ used as a gemstone all over the world, and it is highly appreciated by mineral collectors, due to is rarity and extreme beauty.

Origin

Ouro Preto

Curiosities

‘Imperial Topaz’ would have been officially named as such in 1881, by Brazil´s Emperor, Dom Pedro II, and the Empress, Dona Tereza Cristina, as they received as a gift one of such gemstones by the French mineralogist Claude-Henri Gorceix, the founder of Escola de Minas de Ouro Preto.

Use

Imperial Topaz is used in jewelry manufacturing. Imperial Topaz photo credit: Leonardo Miranda

ABC of mining