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