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What is this rock?

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What is this rock?

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subby613 Joined: Mon Jun 25, 2012 9:26 pm Posts: 1	What is this rock? I went to Arizona and found this rock at the Wave Rock site. Could someone tell me what it is? Attachments: photo.JPG [ 254.5 KiB \| Viewed 1624 times ]
Mon Jun 25, 2012 9:28 pm

O_Stevens Joined: Wed Jun 09, 2010 9:25 pm Posts: 47	Re: What is this rock? subby613, Welcome to the forums. Difficult to say what kind of rock this is. I would either go for a extrusive lava (igneous) or for iron concretions in a sandstone (sedimentary with diagenetic overprint). Are there loose sand (quartz) grains to be seen. Does it scratch into metal? If so, it's probably a sandstone.
Mon Jun 25, 2012 10:03 pm
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Patrick898 Joined: Wed Mar 27, 2013 12:18 pm Posts: 10	Re: What is this rock? A rock is formed naturally solid and the combination of two or more that two minerals. For instance, the granite is the aggregate of quartz, feldspar and biotite minerals. I think It is like sedimentary type of rock.
Tue Apr 02, 2013 6:18 am

WWLittle Joined: Thu Jan 10, 2013 6:49 am Posts: 2	Re: What is this rock? It's hard to tell without a little more magnification, but it appears to be a humanized sandstone. That is a sandstone composed of quartz and maybe feldspar grains that once had a clay-rich matrix, It is common for such a matrix, and the feldspar grains, to alter to hematite upon weathering.
Mon Jan 06, 2014 12:38 am
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