Catalog Search Guide
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Topaz
Topaz is an aluminum fluorosilicate mineral, Al2SiO4(F,OH)2, crystallizing in the orthorhombic system with a distinctive prismatic habit and perfect basal cleavage. Prized for its glassy vitreous luster and hardness of 8 on the Mohs scale, it forms in granitic pegmatites, greisen veins, and high-temperature rhyolite cavities, typically alongside tourmaline, beryl, quartz, and fluorite. Natural color ranges widely from colorless and pale blue to golden yellow, sherry-brown, and the rare, highly sought pink and red tones caused by trace chromium.
The type locality tradition centers on Brazil's Minas Gerais, especially the historic mines around Ouro Preto, source of the famed golden-orange Imperial Topaz — Brazil's national gemstone — as well as fine pink crystals from Brumado in Bahia and giant crystals from Mimoso do Sul in Espírito Santo. Russia's Ural Mountains, particularly the classic locality of Murzinka near Ekaterinburg, produced the legendary blue and light-green Topaz that once rivaled Brazilian material before these historic mines were exhausted. Siberia's Nerchinsk district in Transbaikalia yielded multicolored yellow and blue crystals, while Volodarsk-Volynskii in Ukraine's Zhytomyr region is famous for transparent, often etched gem crystals. Pakistan's Gilgit and Skardu districts, including the Shigar Valley, Shengus, and Dassu, are renowned for large, gemmy, pale-blue and pink thick crystals extracted from alpine-type fissures. Additional important sources include the gem gravels of Mogok in Myanmar, the Gaoligong Mountains of Yunnan, China, Nigeria's pegmatite fields, and classic American localities such as the Thomas Range in Utah and San Diego County, California.
Collectors value Topaz for its combination of size, clarity, and color rarity: naturally deep blue or magenta stones from the Urals, matrix specimens (uncommon since basal cleavage causes crystals to separate easily), and untreated pink or red crystals command premium prices, since most commercial blue and pink Topaz on the market has been irradiated or heat-treated from paler starting material. Fine, well-terminated crystals from Pakistan, Brazil, and historic Russian finds remain benchmark specimens for any serious mineral collection, prized for sharp crystal faces, exceptional transparency, and the vivid palette this species is famous for.
