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990 Views 3 Replies Last post: May 11, 2014 6:03 PM by emmalou RSS
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May 11, 2014 2:10 PM

Rocks to id please

These 3 were found on half moon bay heysham, lancashire.

Any help deeply appreciated!


1. is it from something larger that was man made? it has squares and rectangles all over it.


2.  very very smooth to touch and almost a rainbow of colours in it.


3. what would have caused the parallel lines on this rock?

    • Currently Being Moderated
      May 11, 2014 3:11 PM (in response to emmalou)
      Re: Rocks to id please


      Just a lump of purplish quartzite. The rainbow colours are probably due to various degrees of impregnation with iron-richer chemicals (I wouldn't like to say quite which minerals might have taken-up the iron).

      The quartzite is probably sedimentary rather than metamorphic, so one might call it a quartz arenite to be more correct.



      Probably just a lump of quarzite; the indentations could be where mud clasts or other stones have weathered-out.



      Septarian nodule; niceone; scroll down this page to find out more




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