Difference between revisions of "Topaz"
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| + | {{Mineral | ||
| + | |name=Topaz | ||
| + | |image=Topaz.jpg | ||
| + | |cdesc=Aluminum silicate fluoride hydroxide | ||
| + | |formula= Al<sub>2</sub>[(F,OH)<sub>2</sub>|SiO<sub>4</sub>] | ||
| + | |colors=Colorless, white, pale blue, light green, yellow, yellowish brown, or red | ||
| + | |streak=White | ||
| + | |hardness=8 | ||
| + | |cleavage=Perfect (001) | ||
| + | |fracture=Irregular/Uneven, Sub-Conchoidal | ||
| + | |sgravity=3.5 - 3.6, Average = 3.55 | ||
| + | |csystem=Orthorhombic | ||
| + | |chabit=Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
| + | |enviro=Pegmatites and high temperature quartz veins. Cavities in granites and rhyolites. | ||
| + | |occur=include Minas Gerias, [[Brazil]]; [[Pakistan]]; San Diego Co, [[California]]; Ural Mountains, [[Russia]]; [[Mexico]] and the Thomas Range, [[Utah]]. | ||
| + | |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. | ||
| + | }} | ||
| + | |||
'''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]]. | '''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]]. | ||
| + | |||
| + | ==Gallery== | ||
| + | <gallery> | ||
| + | Image:Topaz2.jpg|'''Topaz sample''' | ||
| + | </gallery> | ||
| + | |||
| + | ==External Links== | ||
| + | *[http://mineral.galleries.com/minerals/silicate/topaz/topaz.htm Amethyst Galleries] | ||
| + | *[http://www.mindat.org/min-3996.html Mindat.org] | ||
| + | *[http://webmineral.com/data/Topaz.shtml Webmineral] | ||
[[Category:Birthstones]] | [[Category:Birthstones]] | ||
| − | |||
[[Category:Gems]] | [[Category:Gems]] | ||
Revision as of 00:13, December 23, 2008
| Topaz | |
|---|---|
| |
| Chemical name | Aluminum silicate fluoride hydroxide |
| Chemical formula | Al2[(F,OH)2 |
| 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
