5" x 3.5"
Says, "Mediterranean at exit of Rhone where outgassing makes geoclutter", the exact words spoken to me when bag of mud was handed to me off the dock when R/V Oceanus was being unloaded. I was also told that the bubbles of gas were fogging the sonar. The exterior is this sediment glaze. Interior is shiny brown and thumb-well is aqua sea-glass.