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Precious Opal (Var: Black Opal)


Precious Opal (Var: Black Opal) : SiO2·nH2O

Photo Copyright © 2000-2001 by John H. Betts. All Rights Reserved.
This photo, and many others, have been provided by John Betts Fine Minerals - http://www.johnbetts-fineminerals.com - For more fine minerals click here.  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: Virgin Valley District, Humboldt Co., Nevada, USA
Section of fossilized tree limb that is now completely replaced by black opal - the rarest and most sought-after form of opal. The fire (play of colors) is brilliant and stunningly contrasted by the black color. Total weight = 26.48 carats. Overall size of mineral specimen: 20x13x11 mm. Size of individual crystals: 1-2 mm.

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