Agateware (noun and sometimes used as an adjective) is a type of pottery with striations and colored effects produced by blending different colored clays together. Sometimes the effect is also produced by using surface slips, but this generally does not look quite the same as true agateware.
Agateware is named after the semi-precious stone, agate, which is a striated form of quartz.
When making an agateware clay body, you must match the clays used in terms of their shrinkage rate. Otherwise, striated sections may break away from each other. (adjective)
When placed with other types of pottery, agateware can be quite striking. (noun)