Please help find out what this rock formation is and where it is found in the world? enter image description here


closed as off-topic by user12525, Peter Jansson, Jan Doggen, arkaia, Fred Jul 13 at 17:20

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  • 3
    $\begingroup$ Is it really rock, or is some form of home baked good or confectionery? $\endgroup$ – Fred Mar 22 '18 at 17:20
  • $\begingroup$ @Fred maybe it's a piece of tar from a road? $\endgroup$ – Eevee Mar 22 '18 at 17:22

Base rock is most likely quartz or feldspar. My best guess is that your specimen is a pseudomorph. I think it might be quartz or feldspar psuedomorph after amphibole or pyroxene.

As for location, you would need to find a matching specimen online or in a museum.

In mineralogy, a pseudomorph is a mineral or mineral compound that appears in an atypical form (crystal system), resulting from a substitution process in which the appearance and dimensions remain constant, but the original mineral is replaced by another. The name literally means "false form".

Here is Talc after quartz from Germany. www.irocks.com enter image description here

Here is quartz after anhydrite. enter image description here


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