This fossilised gastropod from the Colombian mine of Gachala has been completely replaced by precious emerald. Formed from hydrothermal fluids in a shear zone interacting with the rock they passed through, the fossil in the host black shale was transformed. If you look carefully you can also see many small crystals of pyrite, a common inclusion in emeralds from this country. - TheEarthStory 

Origional Photo - http://www.mindat.org/

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  23. theletterkilleth reblogged this from liesegangpoisoning and added:
    pyrite (iron sulfide) is actually a fairly common replacement mineral for fossils in general, owing to the sulfur...
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  29. hopehoweverdire said: Imagine that. You might feel like you’re worthless in life, just a little snail. But, one day, you could be friggin’ emeralds.
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    cooL!
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