Andean Opal

Andean Opal is a trade name for greenish blue opal found in Peru. It appeared in Lima together with chrysocolla in the early 1970s.

Blue opal is usually translucent, brown and black dendrite inclusions are common. Transparent material yields attractive cut stones, but some of them turn milky after some time. The transparency can be restored by immersion in water for a limited time.
General Information
A variety or type of:Common Opal, which is a variety of Opal
Colour
Colour (General)Blue, greenish blue
J. Hyrsl, Gemstones of Peru (2012)
Causes of ColourThe copper content in blue opal is up to 1% Cu, it is coloured by irregular microscopic inclusions of chrysocolla (Fritsch et al., 1999) or other Cu silicate. Galillou et al. (2008) states that the inclusions can be Mg-rich shattuckite.
J. Hyrsl, Gemstones of Peru (2012)
TransparencyTransparent,Translucent
J. Hyrsl, Gemstones of Peru (2012)
Further Information
Mineral information:Andean Opal information at mindat.org
Significant Gem Localities
Peru
 
  • Arequipa Department
    • Caraveli Province
Copyright © Jolyon & Katya Ralph 1993-2017. Site Map. Locality, gem & photograph data are the copyright of the individuals who submitted them. For more information please contact the . Gemdat.org is an online information resource dedicated to providing free gemmological information to all.