As a sub-category of quartz (commonly known as crystal), Ametrine was named due to its representation of purple and yellow on the surface at the same time, and the word was combined by Amethyst and Citrine.Name: AmetrineRefraction: 1.544-1.553Proportion: 2.66Hardness: 7Crystal system: hexagonalChemical element: Sio2Anahi, one of the Bolivia mining areas in South America, is the only one origin for Ametrine, due to the reason that Anahi adjacent to Brazil, Ametrine was mistakenly regarded as being produced in Brazil until the end of twentieth. It is common that bouquet, travel information booklets, advertise and commercial would use Bolivianite to call the quartz to declare that it is found in Bolivia rather than Brazil. The precious stone was introduced to Europe in seventeenth century. In addition, Anahi mining area can produce high qualified amethyst and citrine.There is a legendary story about the origin of the name Anahi Mining, it was said Don Felipe de Urriola y Goitis, conquer of Spanish army married princess Anahi of the Indian Ayoeros family; as the dowry of the princess was veins that rich in the quartz, which decided the name of the mining area. However, Spanish did not care too much about the vein; more attention was paid to gold and silver instead! It was widely rumored that the Ayoreos was afraid of wasting of the vein when princess Anahi and her husband planed to have a tour on Spanish, they decided to sacrifice the princess to stop their exodus, hence Anahi finally died in arms of her Spanish husband. The treasure that was hanging on the neck of the princess was handed to the husband, not until the moment when Don Felipe de Urriola y Goitia looked closely at the treasure, did he realize it was a perfect stone with double color, yellow and purple of Ametrine, which symbolize the love of Princess Anahi for her family and the husband respectively.Technology of heat treatment is widely used in various crystals to change their color; heated citrine would take on relatively concentrated chroma as orange, while natural citrine frequently presented with light chroma as lemon yellow. By heated treatment, color of Amethyst can be changed into yellow to turn the crystal into citrine, and there is case to form ametrine by heated amethyst with temperature among 450-550. With relatively lager particles whose color would take on a richer form, most of the quartz we can see in market is frequently of square shape in convenience to manifest the contrast effect of the two colors. Standards to purchase an amecrine are based on color different to distinguish yellow and purple, color intensity, degree of distinguished boundary and the average distributions of the two colors.
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