10.5" x 3"
Same materials on front and back look different because of application thickness. Center spiral is "All" glaze that pooled and melted in the grooves and slid off the high places; it's the only sediment I use that is a mixture from many places: Mediterranean and Bering Seas, Atlantic, Pacific and Indian Oceans.
Brown is the Mid-Atlantic Ridge rock slurry. Crackled groove that frames the spiral is blue sea-glass. Click on the back image for a larger view, if you'd like to read the words.
Rim and foot are glazes assembled from refined materials.