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On my trip to Chamonix Alps I found this stone and I'm really interested what is this dark green mineral.

Color of the stone is dark green. I can't break a bit of it and it seems very much homogeneous. For its size, around 3cm (whole stone) its weight isn't unexpectable. Since I'm still on this trip, I don't have any scale or ruler to measure it. I found it between some big stones near some lake in Alps. I did see some similar stone nearby but only few. I can scratch it with fingernails but only a bit (fingernail = 2.5 mohs scale).

Thank you very much.

stone

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  • $\begingroup$ Hi Danijel, welcome to Earthscience.SE. We have a guide on how to ask a good "identify this rock" question at earthscience.meta.stackexchange.com/a/125/39. Please could you edit your question to give as much of that information as possible? People are more likely to be able to help you that way. $\endgroup$ – Semidiurnal Simon Oct 9 '17 at 12:47
  • $\begingroup$ maybe epidote? or any other green mineral that could be fine grained. chlorite, glauconite, pumpellyite, prehnite. maybe some clay mineral? could also be a very unimpressive of something like pyroxene or amphibole. it could really be anything. $\endgroup$ – Gimelist Oct 10 '17 at 10:56

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