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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 discovered and mined 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.
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