GeologyRocks

• Location: White Scar Caves, North Yorkshire.
• Date Taken (dd-mm-yy): 09/08/07

A structure called "The Devil's Tongue", we were told that the artificial lighting accounted for any green algal growth. However, I'm uncertain as to the source of the blue/purple hue. Whether it occurs as a result of camera flash or a mineral other than calcium carbonate being deposited I don't know.