Asked • 03/19/19

How can a non-geologist identify a rock?

I found a rock on a beach in north-east Evia, Greece. Half is light gray, and half is dark gray. There are white (or very light gray) thin lines that form swirls throughout, crossing the light/dark gray boundary in the main body of the rock. To me, they look like fossilized leaves or something similar.What is the best way to work out what this is? There seems to be an abundance of different rock types, many colors, but there are many similar stones to this one, all worn into smooth rounded pebbles.

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