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Multi coloured rock???

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When beach combing in south Pembrokeshire, Wales, I found a very peculiar rock. It has multiple colours on one side, and it looks as if it is on the inside and that it has been broken in two. Have a look a the pictures below and tell me what you think.alt text

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asked Oct 21, 2013 by Penguin453 (200 points)

2 Answers

0 votes

Thats a nice piece to find on a beach! It looks too grainy in texture and too opaque to be agate, but is still probably some sort or chalcedony. It has a conchoidal fracture which is one sign in that direction. Any way to test the hadnress? Will it scratch a piece of quartz?

answered Oct 22, 2013 by hershel (46,460 points)

It does scratch quartz and generates a burning smell when scratched.

0 votes

could it be flint maybe?

answered Oct 28, 2013 by Penguin453 (200 points)

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