This page will contain discussion groups about Topaz, as they become available.

Topaz

This article is about the mineral or gemstone, for other uses see: Topaz (disambiguation).

Topaz 4 Carat Oval Shape Topaz Gemstone Ring Enhanced with Azotic(r)Treatment Heart Cut Sky Blue Topaz Ring

The mineral topaz is a silicate of aluminium and fluorine with the chemical formula Al2SiO4(F,OH)2. It crystallizes in the orthorhombic system and its crystals are mostly prismatic terminated by pyramidal and other faces, the basal pinacoid often being present. It has an easy and perfect basal cleavage and so gemstones or other fine specimens should be handled with care to avoid developing cleavage flaws. The fracture is conchoidal to uneven. Topaz has a hardness of 8, a specific gravity of 3.4-3.6, and a vitreous lustre. Pure topaz is transparent but is usually tinted by impurities; typical topaz is wine or straw-yellow. They may also be white, gray, green, blue, or reddish-yellow and transparent or translucent. When heated, yellow topaz often becomes reddish-pink. It can also be irradiated, turning the stone a light and distinctive shade of blue. A recent trend in jewelry is the manufacture of topaz specimens that display iridescent colors, by applying a thin layer of titanium oxide via physical vapor deposition.

Topaz is found associated with the more acid rocks of the granite and rhyolite type and may be found with fluorite and cassiterite. It can be found in the Ural and Ilmen mountains, Czech Republic, Saxony, Norway, Sweden, Japan, Brazil, Mexico, and the United States.

Etymology and historical/mythical usage

The name "topaz" is derived from the Greek topazos, "to seek," which was the name of an island in the Red Sea that was difficult to find and from which a yellow stone (now believed to be a yellowish olivine) was mined in ancient times. In the Middle Ages the name topaz was used to refer to any yellow gemstone, but now the name is only properly applied to the silicate described above.

According to Rebbenu Bachya, the word "Leshem" in the verse Exodus 28:19 means "Topaz" and was the stone on the Ephod representing the tribe of Dan.

Topaz is also the birthstone of November.

Example of Heat Treated Topaz-Pink Topaz Pear Cut Ring

References

  • Webmineral
  • Mindat with location data
  • Mineral galleries

This page about Topaz includes information from a Wikipedia article.
Additional articles about Topaz
News stories about Topaz
External links for Topaz
Videos for Topaz
Wikis about Topaz
Discussion Groups about Topaz
Blogs about Topaz
Images of Topaz

Topaz is also the birthstone of November. Said design has since been replaced. According to Rebbenu Bachya, the word "Leshem" in the verse Exodus 28:19 means "Topaz" and was the stone on the Ephod representing the tribe of Dan. One of the shoe patterns resembeled that of a leaf from a cannibus sativa plant. In the Middle Ages the name topaz was used to refer to any yellow gemstone, but now the name is only properly applied to the silicate described above. There was some controversy when, in 2005, they offered a "design your own shoe" portion of their webstore. The name "topaz" is derived from the Greek topazos, "to seek," which was the name of an island in the Red Sea that was difficult to find and from which a yellow stone (now believed to be a yellowish olivine) was mined in ancient times. The tour is named Vans Warped Tour.

It can be found in the Ural and Ilmen mountains, Czech Republic, Saxony, Norway, Sweden, Japan, Brazil, Mexico, and the United States. Vans also sponsors the Warped Tour, a punk/ska music and extreme sports festival since 1995. Topaz is found associated with the more acid rocks of the granite and rhyolite type and may be found with fluorite and cassiterite. In 2004 the company was acquired by VF Corporation, manufacturers of Lee and Wrangler Jeans for $396 million. A recent trend in jewelry is the manufacture of topaz specimens that display iridescent colors, by applying a thin layer of titanium oxide via physical vapor deposition. Since approximately 2001 Vans has opened retail stores containing large indoor skate parks at The Block at Orange, Ontario Mills, the Moorestown Mall, Potomac Mills, the Plaza at King of Prussia, and other locations. It can also be irradiated, turning the stone a light and distinctive shade of blue. Four years after emerging from bankruptcy protection, investment bankers McCown DeLeeuw Company bought Vans and went public in 1991.

When heated, yellow topaz often becomes reddish-pink. The corporation was forced into bankruptcy in 1984. They may also be white, gray, green, blue, or reddish-yellow and transparent or translucent. In the 1980s, Vans lost much of its core customer base when the company started producing baseball and football shoes. Pure topaz is transparent but is usually tinted by impurities; typical topaz is wine or straw-yellow. In more recent years, Vans has marketed additional items such as clothing and skateboarding accessories. Topaz has a hardness of 8, a specific gravity of 3.4-3.6, and a vitreous lustre. They market heavily in the surfing and skateboarding areas.

The fracture is conchoidal to uneven. The Van Doren Rubber Company, better known as "Vans", has been since 1966 a Southern California based manufacturer of sneakers and other shoe types catering primarily to the active youth market. It has an easy and perfect basal cleavage and so gemstones or other fine specimens should be handled with care to avoid developing cleavage flaws. It crystallizes in the orthorhombic system and its crystals are mostly prismatic terminated by pyramidal and other faces, the basal pinacoid often being present. The mineral topaz is a silicate of aluminium and fluorine with the chemical formula Al2SiO4(F,OH)2.

This article is about the mineral or gemstone, for other uses see: Topaz (disambiguation).. Mineral galleries. Mindat with location data. Webmineral.

04-20-14 FTPPro Support FTPPro looks and feels just like Windows Explorer Contact FTPPro FTPPro Help Topics FTPPro Terms Of Use ftppro.com/1stzip.php ftppro.com/zip ftppro.com/browse2000.php PAD File Directory Business Search Directory Real Estate Database FunWebsites.org PressArchive.net WebExposure.us Display all your websites in one place HereIam.tv Celebrity Homepages Charity Directory Google+ Directory