This page will contain images 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.
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Topaz is also the birthstone of November. The fictional Transformers Universe:. 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. Transformer or Transformers may refer to:. 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. Transformers (Flash Animation), a popular loop-based Flash animation. 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. Transformers (game), based on the Transformers: Armada TV series.

It can be found in the Ural and Ilmen mountains, Czech Republic, Saxony, Norway, Sweden, Japan, Brazil, Mexico, and the United States. Transformers (2007 film), the 2007 live-action movie. Topaz is found associated with the more acid rocks of the granite and rhyolite type and may be found with fluorite and cassiterite. Transformers: The Movie, the 1986 animated movie. 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. Transformers (toyline), a line of toys. It can also be irradiated, turning the stone a light and distinctive shade of blue. Transformers (comic), produced primarily by Marvel Comics (1984-1993), Dreamwave Productions (2002-2004), and IDW Publishing (2005-present).

When heated, yellow topaz often becomes reddish-pink. Transformers series, television series. They may also be white, gray, green, blue, or reddish-yellow and transparent or translucent. Transformers Universes. Pure topaz is transparent but is usually tinted by impurities; typical topaz is wine or straw-yellow. Transformers category in Wikipedia. Topaz has a hardness of 8, a specific gravity of 3.4-3.6, and a vitreous lustre. Transformers (myth) of Pacific Northwest native myth.

The fracture is conchoidal to uneven. Transformer (album), Lou Reed's 1972 rock album. 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. Transformer, an electrical device. 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.

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