Posted: Jul 25, 2010 3:55 pm
by mark1961
The large kidney shaped dark indigo one near the bottom right. Looks like it might be a worn down brick to me. Also the curved flat one above it could be a roof tile or pot shard.

http://www.danielnurgitz.com/guide.html#1

(Scroll down to "page 8")

Different coloured pebbles like this can make for art as well as an illustration of the passing of glaciers mixing up geology.