Difference between revisions of "Topaz"

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{{Mineral
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|name=Topaz
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|image=Topaz.jpg
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|cdesc=Aluminum silicate fluoride hydroxide
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|formula= Al<sub>2</sub>SiO<sub>4</sub>(F, OH)<sub>3</sub>
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|colors=Colorless, white, pale blue, light green, yellow, yellowish brown, or red
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|streak=White
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|hardness=8
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|cleavage=Perfect (001)
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|fracture=Irregular/Uneven, Sub-Conchoidal
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|sgravity=3.5 - 3.6, Average = 3.55
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|csystem=Orthorhombic
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|chabit=Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
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|enviro=Pegmatites and high temperature quartz veins. Cavities in granites and rhyolites.
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|occur=include Minas Gerias, [[Brazil]]; [[Pakistan]]; San Diego Co, [[California]]; Ural Mountains, [[Russia]]; [[Mexico]] and the Thomas Range, [[Utah]].  
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|nameorigin=Named after Topasos Island in the Red Sea. In antique times, the name was probably used for the gemstone that is now known as [[peridot]].
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}}
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'''Topaz''' is one of the hardest minerals rating an 8 on the [[Mohs Hardness Scale|Mohs hardness scale]].  Chemically, topaz is Aluminum silicate fluoride hydroxide Al<sub>2</sub>SiO<sub>4</sub>(F, OH)<sub>3</sub> and is classified as a [[silicate]].  It is commonly used as a [[gemstone]] and its crystals can grow to a very large size. Topaz is commonly a shade of yellow or orange, but may also be colorless and is found in the [[blue]] and [[green]] ranges. Topaz is the [[birthstone]] for [[November]].
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==Gallery==
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<gallery>
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Image:Topaz2.jpg|'''Topaz sample'''
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</gallery>
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==External Links==
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*[http://mineral.galleries.com/minerals/silicate/topaz/topaz.htm Amethyst Galleries]
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*[http://www.mindat.org/min-3996.html Mindat.org]
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*[http://webmineral.com/data/Topaz.shtml Webmineral]
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[[Category:Birthstones]]
 
[[Category:Birthstones]]
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[[Category:Minerals]]
 
 
[[Category:Gems]]
 
[[Category:Gems]]

Revision as of 21:31, January 2, 2012

Topaz
Topaz.jpg
Chemical name Aluminum silicate fluoride hydroxide
Chemical formula Al2SiO4(F, OH)3
Identification
Colors Colorless, white, pale blue, light green, yellow, yellowish brown, or red
Crystal habit Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Crystal system Orthorhombic
Cleavage Perfect (001)
Fracture Irregular/Uneven, Sub-Conchoidal
Hardness 8
Name origin Named after Topasos Island in the Red Sea. In antique times, the name was probably used for the gemstone that is now known as peridot.
Specific gravity 3.5 - 3.6, Average = 3.55
Streak White


Topaz is one of the hardest minerals rating an 8 on the Mohs hardness scale. Chemically, topaz is Aluminum silicate fluoride hydroxide Al2SiO4(F, OH)3 and is classified as a silicate. It is commonly used as a gemstone and its crystals can grow to a very large size. Topaz is commonly a shade of yellow or orange, but may also be colorless and is found in the blue and green ranges. Topaz is the birthstone for November.

Gallery

  • Topaz sample

External Links

Retrieved from "https://www.conservapedia.com/index.php?title=Topaz&oldid=950750"