Klein, Cornelis Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico.
- Additional Readings
A mineral of composition CuAl6(PO4)4(OH)8 · 5H2O in which considerable ferrous ion (Fe2+) may substitute for copper. Ferric ion (Fe3+) may also substitute for part or all of the aluminum (Al), forming a complete chemical series from turquoise to chalcosiderite [CuFe6(PO4)4(OH)8 · 5H2O]. Turquoise with a strong sky-blue or bluish-green to apple green color is easily recognized, and such material is commonly used as a gem. Some variscite, of composition AlPO4 · 2H2O with minor chemical substitutions of Fe3+ and or chromium ion (Cr3+) for aluminum and with a soft, clear green color, may be marketed as green turquoise.
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