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590 Views 6 Replies Last post: Jan 20, 2014 9:48 PM by Tabfish RSS
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Jan 19, 2014 7:04 PM

aztec pattern on the rock? fossil?

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HI

Was wondering if this rock might be some kind of a fossil, any ideas?

Thanks

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    Jan 19, 2014 7:25 PM (in response to 1bear)
    Re: aztec pattern on the rock? fossil?

    Don't think it's a fossil but I don't know what mineral it is.  Maybe Mike knows?

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      Jan 19, 2014 9:13 PM (in response to Dan)
      Re: aztec pattern on the rock? fossil?

      Very interesting...

       

      No (Dan), I don't know; at least not off the top of my head. (But thanks for the vote of confidence!)

       

      It reminds me of a fine-grained red siltstone I saw in northern Spain back in 1977. That had very fine lamination, shown by subtle colour contrasts; the laminations were very contorted; clearly it had been liquidized and mobilized since it was deposited (and before it became lithified, of course).

       

      But I don't want to jump to conclusions.

      Highly intricate flow structures can also arise in industrial slag - where some mineral and/or by-product and/or waste becomes molten, gets spilled or raked-off, and cools - leaving its inhomogeneities showing how it had been swirled around before it set.

       

      So, some questions:

      - where did it come from (as accurate as you can)?

      - did you pick it out of solid rock or was it lying loose?

        - if lying loose, in what situation?

         - if from solid rock, what was that rock like?

      - were there other lumps like this one? many?

      - does it seem heavier or lighter than you'd expect for an average sort of rock of its size

      - is a magnet attracted to it?

      - is a steel knife attracted to it?

      - if you scratch it along the back (rough side) of a ceramic tile, what colour mark does it leave?

      - does it 'ring' if you hit it with a hammer (as if it was metal), or does it give a duller noise?

       

      Mike       

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