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Prasiolite

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Title: Prasiolite  
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Prasiolite

Prasiolite (quartz variety)
Raw natural prasiolite
General
Category Oxide mineral
Identification
Color shades of green
Crystal habit Hexagonal prisms
Crystal system Trigonal
Cleavage None
Fracture Conchoidal[1]
Tenacity brittle[1]
Mohs scale hardness 7 – lower in impure varieties[1]
Diaphaneity Transparent to nearly opaque
Specific gravity 2.65
Refractive index 1.544 to 1.553[2]
Birefringence 0.009[3]
Ultraviolet fluorescence none

Prasiolite, green-quartz or vermarine is a green form of quartz, a silicate mineral chemically silicon dioxide. Prasiolite is one of several quartz varieties. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, but it is also seen in Lower Silesia in Poland. Naturally occurring prasiolite is also found in the Thunder Bay area of Canada.[4]

Prasiolite can also be found spelled praziolite. Prasiolite can be confused with the similarly colored praseolite which results from the heat treatment of iolite, a variety of cordierite.[5]

It is a rare stone in nature. Most prasiolite sold is used in jewellery settings. Prasiolite is heat treated amethyst.[4] Most amethyst will turn yellow or orange when heated producing citrine. But some amethyst will turn green when treated. Currently, almost all prasiolite on the market results from a combination of heat treatment and ionizing radiation.[6]

Green quartz is sometimes incorrectly called green amethyst, which is an actual misnomer and not an acceptable name for the material, the proper terminology being Prasiolite.[7] It is actually against Federal Trade Commission Guidelines to call prasiolite "green amethyst." Other names for green quartz are vermarine, greened amethyst, or lime citrine.

The name is derived from Greek πράσον prason meaning "leek" and λίθος lithos meaning "stone." This means that "prasiolite" literally means "scallion green-colored stone." The mineral was given its name due to its green-colored appearance.

See also

References

  1. ^ a b c Prasiolite on Gemdat.org
  2. ^ Lazarelli. Blue Chart Gem Identification. p. 7. 
  3. ^ http://www.galleries.com/Prasiolite
  4. ^ a b "Prasiolite". quarzpage.de. 28 October 2009. Retrieved 28 November 2010. 
  5. ^ "Prasiolite". Amethyst Galleries' Mineral Gallery. 
  6. ^ "Mineral Spectroscopy Server". California Institute of Technology. 11 June 2012. Retrieved 10 December 2012. 
  7. ^ "Green Amethyst". GemSelect. Retrieved 10 December 2012. 

External links

  • - Prasiolite on Mindat.org


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