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Ametrine

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					Ametrine
From Wikipedia, the free encyclopedia

Ametrine, also known as trystine or by its trade name as bolivianite, is a naturally
occurring variety of quartz. It is a mixture of amethyst and citrine with zones of
purple and yellow or orange. Almost all commercially available ametrine is mined in
Bolivia, although there are deposits being exploited in Brazil and India.
The colour of the zones visible within ametrine are due to differing oxidation states
of iron within the crystal. The different oxidation states occur due to there being a
temperature gradient across the crystal during its formation.
Artificial ametrine can be created by differential heat treatment of amethyst.
Legend has it that ametrine was first introduced to Europe by a conquistador's gifts
to the Spanish Queen, after he received a mine in Bolivia as a dowry when he                                             Ametrine
married a princess from the native Ayoreos tribe.[1]
Most ametrine in the low price segment can surely be assumed to stem from synthetic material. Since 1994 a Russian
laboratory has perfected the industrial production of bicolored quartz crystals that are later irradiated to bring out the typical
ametrine colors. Green-yellow or golden-blue ametrine does not exist naturally.

References
   1. ^ Vasconcelos, Paolo; Wenk, Hanz-Rudolf; Rossman, George. "The Anahí Ametrine Mine, Bolivia," Gems and Gemology, Spring
      1994, p. 4-23

External links
      http://www.gemstone.org/gem-by-gem/english/ametrine.html
                                                                                                                Wikimedia Commons has media
      http://mineralminers.com/html/amtminfo.htm
                                                                                                                related to: Ametrine
      http://www.mindat.org/show.php?id=7606
      http://www.gia.edu/newsroom/issue/2798/2462/insider_newsletter_details.cfm

  V   · T· E·                                                                Silica minerals
           Crystalline   Coesite · Cristobalite · Moganite · Quartz · Seifertite · Stishovite · Tridymite ·

  Cryptocrystalline      Chalcedony · Chert · Flint · Jasper ·

          Amorphous      Fulgurite · Lechatelierite · Opal ·

       Miscellaneous     Tiger's eye ·

                          Chalcedony      Agate · Carnelian · Chrysoprase · Heliotrope · Onyx ·

  Notable varieties               Opal    Fiorite · Geyserite ·

                                Quartz    Amethyst · Ametrine · Milky quartz · Rose quartz · Smoky quartz · Shocked quartz ·



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