Put a few days of research into this. Sorry, I'm new to geology. Going to read a book on it when I have time, I've got one lying in my basement somewhere.

It seems to be a layer of what looks like sort of granite rock, but a solid color. Then a calcite inside, which I don't think matches up. Took me about 10m each of throwing it against another rock (found these at the beach, didn't have access to tools.)

On Moh's scale, it's less than 2.5 (fingernail), I'm not sure how to test for less.

Found on Long Island, NY.

Ask me any follow up questions if needed.

enter image description here

  • $\begingroup$ Can you add better pictures that are not over saturated? Photograph in daylight, out of the direct sun. $\endgroup$ – Jan Doggen Aug 21 '17 at 8:44
  • $\begingroup$ If you put the rock in that bottle of yours you can measure its volume and thus density. $\endgroup$ – gerrit yesterday

The rock on the left appears to be a quartz pebble. The rock on the right is too bleached out by a light source to clearly see it but shape suggests it is also a quartz pebble.

  • $\begingroup$ Oh, I'm sorry about the light. The "quartz" in the one on the right looks like the one on the left except it's just lighter. $\endgroup$ – seamusconnerkeebler493 Aug 2 '17 at 14:24

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