MICA RED Sold in 25lb increments. Is a clay similar to Indian pottery from around Northern New Mexico. The clay is from the Manzano Mountains here in Albuquerque. MICA RED can be glazed if bisqued to cone 04. For cooking pots bisque to cone 010 to 017. CONE: 04 SHRINKAGE: 6% ABSORPTION: 7.7% PENTROMETERS: 5.6