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Ametrine

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Name:
Combination of "amethyst" and "citrine".
A variety of Quartz


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.

Classification of Ametrine

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Other Names for Ametrine

Name in Other Languages:
Spanish:Bolivianita

Other Information

Health Risks:
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

Specimens:
The following Ametrine specimens are currently listed for sale on minfind.com.

Localities for Ametrine

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Bolivia
 
  • Santa Cruz Department
    • Sandoval Province
      • La Gaiba District
http://minerals.gps.caltech.edu/AMETRINE/Index.htm.
Brazil
 
www.minerals.net/mineral/silicate/tecto/quartz/images/quartz/gifs/amthyst8.htm.
Canada
 
  • Ontario
    • Thunder Bay District
      • McTavish Township
Ontario Gem Company
India
 
  • Andhra Pradesh
http://minerals.gps.caltech.edu/AMETRINE/Index.htm.
Mozambique
 
  • Zambezia Province
    • Alto Ligonha District
Geotrade Bohemia
South Africa
 
  • Mpumalanga Province
    • Nkangala District
      • Mkobola
(Error for yellow iron-stained amethyst; not true ametrine.)
USA
 
  • Nevada
    • Washoe Co.
      • Hallelujah Junction area
        • Petersen Mountain (Hallelujah Junction [sic])
Rocks & Minerals 82:415-418
Mineral and/or Locality  
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