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what is this?

Posted by Anne  
Anne July 13, 2012 08:06AM

we found this at the coast in France (the shore in Ault). It weights 450 gram and is as large as a smal fist.
I'm sorry the foto is not very good, I try to make a beter one.
We like the rock very much...but what is it, how is it formed? If someone knows...I would be happy to know!

open | download - steen.JPG (933.2 KB)
Jolyon & Katya Ralph July 13, 2012 08:47AM
It's a nice group of marcasite crystals, found in the chalk on both sides of the english channel.

Anne July 13, 2012 09:14AM
Thank you Jolyon!
Your reaction helped me to find more information on the internet.
I love google :-)
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