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Hello, I found a couple of big rocks near a dry riverbed that used to be covered with water for nearly four months a year after the snow melts from the mountains nearby. The rocks have been in touch with water a lot. You can also see some moss growing on and inside the rock. I’m wondering what kind of mineral this rock might contain as I know calcite has a weakness against water yet the crystals look really nice. Some look like calcite as I see some crystal cubes on the rock as well. Weight very heavy and took me nearly three hours to get this piece to the car after I decided to walk with it to the car (1 mile of walking distance from the spot back to the car). 

I hope someone can tell me what this is and how to clean it gently. 

Kind regards,

asked Sep 22 by Lemurian (570 points)

2 Answers

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First of all, where do you live? It may be a sort of zeolite, a mineral formed during contact with river water with traces of minerals. Very cool find, lucky you! Please submit more information so we can figure this out!
answered Sep 24 by linkisnotzelda (4,150 points)
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The picture doesn't give you a good insight into the mineral. Its a bit blurry and hard to see the crystal faces. Can you please post some additional photos?
answered 2 days ago by hershel (51,300 points)

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