Chalcanthite : CuSO4·5H2O

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Copyright © Rob Lavinsky & irocks.com
minID: HR4-5CY

Chalcanthite : CuSO4·5H2O

Copyright © Rob Lavinsky & irocks.com  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 13.4 cm x 11.3 cm x 8.7 cm

13.4 x 11.3 x 8.7 cm. This is the largest and best crystallized natural chalcanthite that I have personally seen. It has a huge complete crystal of neon blue, sticking straight up from matrix. It is pristine, glows when backlit, and is from an old-time locality. Chalcanthite is easily synthesized today and grown in labs all around the world for the gift shop and fake rock markets. Chalcanthite forms as post-mining or manmade crystals from working copper mines such as in Arizona. Aside from the chance that this was post-mining (and I do not think it was), it is highly unlikely these were being made in labs and from gift shop chemistry sets back in the early 1900s in Chile. With as many copper mines as we have around, I have not seen any post-mining chalcanthite formed from the runoff of human workings that reaches this magnitude. So I find it unlikely this was formed in that manner, although it’s a slim outside chance. This is, surely then, natural as the museum its self concluded in the end. The wooden display label with it indicates exhibition in a case of trophies brought back from one of the famous Vaux expeditions of the 1920s, apparently. Ex. Academy of Natural Sciences Philadelphia Collection.

This photo has been shown 1889 times
Photo added:17th Dec 2008
Dimensions:794x800px (0.64 megapixels)

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