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2,237 questions

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128,535 users

I'm really curious what kind of rock it is?

0 votes

I found it in Tatra mountains (polish and slovakian border, near Zakopane). It used to be a part of a bigger rock sticking out of the ground. i'm intrigued by the silver parts which are somehow made of really thin layers of something that is almost transparent but altogether its silver, as You can see. The other side of the rock has only little silver spots. It doesn't seem to react to magnets. I would be really thankful for help!

asked Sep 19, 2018 by vanszyd (120 points)

4 Answers

0 votes
Easiest way would be to call a rock shop and ask if they have a way to test rocks or minerals for metals some may have a way to scrape a sample and test it.
answered Sep 21, 2018 by Weasel (58,980 points)
0 votes

Is pyrite known in your country? Maybe it’s some kind of matrix pyrite or granite. I got one similar piece from Sweden in the mountaintops near a glacier. Also got the white matrix and some kind of shiny mineral inside. Some are transculent and some are solid but shiny as well. Here’s a comparison of granite, pyrite in matrix, and the rock I’ve found in Sweden last summer. Still don’t know what it might be but it looks like some mixture of quartz pulled down from the melting glacier where I found it. 

Hope this help you out a bit. There are so many different kinds of minerals that even I can’t keep track of what I find. 

Kind regards,

answered Sep 23, 2018 by Lemurian (950 points)
0 votes
It's very possible the silver "layers" are mica, most likely muscovite. This is especially indicative in the last picture. Can you peel the layers? If so it would most likely be mica. Another possibility would be talc, though talc is usually less lustrous and more dull.
answered Oct 17, 2018 by hershel (52,800 points)
0 votes
conglomerate of quartzite, calcite with mica or schist?
answered Jul 18, 2019 by bthompson49