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Quartz (Var: Chalcedony)


Quartz (Var: Chalcedony)

Photo Copyright © 2007 Peter Cristofono  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: Interior, Jackson Co., South Dakota, USA
8 cm piece of chalcedony from near Interior, South Dakota. Ex- Alan Walworth collection, 1961. Green fluorescence in SW ultraviolet light. Photograph by Peter Cristofono.

This photo has been shown 353 times

Photo added: 3rd Apr 2007



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