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751 Views 2 Replies Last post: Aug 13, 2014 6:19 AM by MikeHardman RSS
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Aug 12, 2014 4:24 PM

What type of rock is this?

Can anyone tell me what kind of rock this is? It was found near the Arizona--New Mexico border. It can scratch glass. Thank you!

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      Aug 13, 2014 6:19 AM (in response to AryaSaph)
      Re: What type of rock is this?

      The orangey translucent mineral is quartz, in a botryoidal form. The opaque white mineral could be quartz, too, or it could be a feldspar, or perhaps calcite/barytes / other vein-filling mineral - can't really be sure just from a photo.


      The botryoidal quartz would have been deposited on the walls of a small cavity, such as occurs in veins or fault breccia. The rest of it might have been formed in the same way, but could also be original rock of a different and possibly much earlier origin, eg. igneous.



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