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174 Views 4 Replies Last post: Jun 10, 2018 11:49 PM by GrahamB RSS
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Jun 7, 2018 10:06 PM

Not just any old iron

Hi Team,

Another rock that I found at Kessingland on the shoreline.  This one has the same infusion of iron as the others I found recently, is very lumpy and looks like Breccia and has obviously not been rolling around in the sea for very long. One side has more iron than the other, whiteish on the reverse, is harder than steel and has a density of 2.4. I have a feeling that it is not quartz, it is begining to polish just from my handling.

Any suggestions please?

Regards

GrahamB

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    Jun 8, 2018 3:32 PM (in response to GrahamB)
    Re: Not just any old iron

    Iron-stained milky quartz - harder than steel.  Density should be c.2.6.  How did you measure this?

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    Jun 11, 2018 7:46 AM (in response to GrahamB)
    Re: Not just any old iron

    I don't think it is smashed and welded together, I think those are just fractures in the rock. The milkyness is due to microscopic inclusions of gas or liquids: https://en.wikipedia.org/wiki/Quartz

     

    The iron may have entered (or been oxidised) along those fractures as some areas away from any fractures appear less iron-stained.

    Capture.JPG

    I would describe this as "rounded" and "medium spherical"

    https://en.wikipedia.org/wiki/Roundness_(geology)

     

    Capture.JPG

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