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.