Earthenware is a type of ceramic made from ordinary clay (as well as silty clay, sandy clay, or clay loam). Much like green glass (and clear glass, to a lesser extent), earthenware items can be produced in unlimited quantities as long as you have a source of clay in your fortress. They are brown in color and have a material value of 3, equal to that of obsidian.
In order to store liquids, earthenware containers must be glazed.
[INORGANIC:CERAMIC_EARTHENWARE] [USE_MATERIAL_TEMPLATE:STONE_TEMPLATE] [STATE_NAME_ADJ:ALL:earthenware] [DISPLAY_COLOR:6:0:0][TILE:'#'] [SOLID_DENSITY:1360] [IS_STONE] [MATERIAL_VALUE:3] [ABSORPTION:10] [BLOCK_NAME:brick:bricks] [DISPLAY_UNGLAZED] [NO_STONE_STOCKPILE]