Chrysocolla : Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O, x < 1
Quartz : SiO2
Photo added to mindat.org
“Blue chrysocolla with quartz, an Arizona-Sonora Desert Museum specimen on display at the 2008 Tucson Show. Ex- Levi Smith collection. This specimen was displayed at the World's Columbian Exposition in Chicago in 1893. P. Cristofono photo.”
Peter Cristofono - 28th February 2008
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