This is described as zeolite pseudomorph.  Maybe someone can verify that?  It's cool, whatever it is.

This is described as zeolite pseudomorph. Maybe someone can verify that? It's cool, whatever it is.

opal beauty by "cobalt123" on flickr / some rights reserved see: http://creativecommons.org/licenses/by-nc-sa/2.0/deed.en

opal beauty by "cobalt123" on flickr / some rights reserved see: http://creativecommons.org/licenses/by-nc-sa/2.0/deed.en

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