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Ametrine
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Anahí Mine (Anay Mine; Anai Mine), La Gaiba District, Sandoval Province, Santa Cruz Department, Bolivia
© Rob Lavinsky
| Name: | Combination of "amethyst" and "citrine". | ||
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A variety of Quartz
Ametrine slab
Ametrine crystals are made of alternating sectors of purple and yellow to orange color. Slabs cut perpendicular to the c axis of the crystal look a bit like a pinwheel. The purple sectors are situated under the positive rhombohedral faces (r), and the yellow sectors under the negative rhombohedral faces (z).
Visit gemdat.org for gemological information about Ametrine. Currently in public beta-test.
Ametrine slab
Ametrine crystals are made of alternating sectors of purple and yellow to orange color. Slabs cut perpendicular to the c axis of the crystal look a bit like a pinwheel. The purple sectors are situated under the positive rhombohedral faces (r), and the yellow sectors under the negative rhombohedral faces (z).
While the purple sectors are made of amethyst, the yellow or orange sectors are not made of citrine, because they are colored by inclusions of iron compounds and would more properly called ferruginous quartz. Accordingly, upon heating ametrine the purple sectors pale, while the yellow-orange sectors keep their color.
Visit gemdat.org for gemological information about Ametrine. Currently in public beta-test.
Classification of Ametrine | ||||
| mindat.org URL: | http://www.mindat.org/min-7606.html Please feel free to link to this page. | |||
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Other Names for Ametrine | ||||
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Other Information | ||||
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. | |||
References for Ametrine | ||||
| Reference List: - + | Balitskii, V. S. & Balitskaya, O. V. (1986): The amethyst-citrine dichromatism in quartz and its origin. Physics and Chemistry of Minerals 13, 415-421. Vasconcelos P, Wenk HR, Rossman GR (1994) The Anahí ametrine mine, Bolivia. Gems and Gemology 30, 4-23. Balitsky VS, Lu T, Rossman GR, Makhina IB, Mar'in, AA, Shigley JE, Elen S, Dorogovin BA (1999) Russian synthetic ametrine. Gems and Gemology 35, 122-134. Balitsky, V. S.; Machina, I. B.; Mar'in, A. A.; Shigley, J. E.; Rossman, G. R.; Lu, T. (2000): Industrial growth, morphology and some properties of Bi-colored amethyst-citrine quartz (ametrine). Journal of Crystal Growth 212, 255-260. | |||
Internet Links for Ametrine | ||||
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| Specimens: | The following Ametrine specimens are currently listed for sale on minfind.com. | |||
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Localities for Ametrine | ||||
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The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the
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(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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