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Ametrine

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About AmetrineHide

Formula:
SiO2
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.


Pronounciation of AmetrineHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Chemical Properties of AmetrineHide

Formula:
SiO2

Synonyms of AmetrineHide

Other Language Names for AmetrineHide

Spanish:Bolivianita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz1 photo of Ametrine associated with Quartz on mindat.org.

Other InformationHide

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 AmetrineHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Schmetzer, K. (2017): Distinction of natural and synthetic ametrine by microscopic examination - a practical approach. Journal of Gemmology 35, 506-529.

Internet Links for AmetrineHide

Localities for AmetrineHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Bolivia
 
  • Santa Cruz
    • 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
 
  • Telangana
http://minerals.gps.caltech.edu/AMETRINE/Index.htm.
Mozambique
 
  • Zambezia Province
    • Alto Ligonha District
Geotrade Bohemia
South Africa
 
  • Mpumalanga
    • Nkangala District
      • Mkobola
(Error for yellow iron-stained amethyst; not true ametrine.)
USA
 
  • Nevada
    • Washoe Co.
      • Hallelujah Junction area
        • Petersen Mountain ("Peterson Mountain"; Hallelujah Junction [sic])
Rocks & Minerals 82:415-418
Mineral and/or Locality  
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