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Unknown brown rock

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alt text

asked May 16, 2014 by Renata (7,820 points)

6 Answers

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This rock was found on a mountain on Peloponnesos, Greece.

It reacts to acid (vinegar) scratches glass but does not leave a streak.

I'm running out of options; though I'm still thinking it is a sort of limestone/dolomite.

Thanks!

answered May 16, 2014 by Renata (7,820 points)
0 votes

alt text

answered May 16, 2014 by Renata (7,820 points)
0 votes

How does it react to acid (vinegar)? Does it form small bubbles? If so its most likely a carbonate. Though carbonates are usually soft and glass is 5.5 - harder then most carbonates...

answered May 25, 2014 by hershel (46,460 points)
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It does not make any bubbles (at least not visible) but you can hear a fizz.

I'm guessing it is something like breccia or an conglomerate.

answered May 26, 2014 by Renata (7,820 points)
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If it was a carbonate, it would make bubbles (i.e. effervesce). What do you mean by "hear a fizz"? It could also be a Jasper if its hardness is closer to 7.

answered May 28, 2014 by hershel (46,460 points)
0 votes

It looks like jasper.

answered Jun 3, 2014 by ahmad (1,260 points)

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