How about Longshan teapot?

The mud of Longshan purple teapot is produced in Huanglong Mountain System in Yixing, Jiangsu Province. It is a high-quality mineral material in purple mud, which is produced at the bottom of purple mud and has good quality. Because of its limited origin and scarcity, it is relatively scarce in the market and has certain collection and investment value.

Because no other ceramic pigments are added, but the temperature is adjusted, the color after firing can show the true color of the raw purple sand ore, and the color is pure.