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According to google, these are “also called Zisha teapot (Chinese: 紫砂; pinyin: zǐshā; Wade–Giles: tsu sha; lit. 'Purple clay'),[1] are made from Yixing clay. This traditional style commonly used to brew tea originated in China, dating back to the 15th century, and are made from clay produced near Yixing in the eastern Chinese province of Jiangsu.”
“Yixing teawares are prized because their unglazed surfaces which absorb traces of the beverage, creating a more complex flavour. For these reasons, Yixing teawares should be washed with water only, never using detergents.”
“Yixing teapots are simple and unadorned, but they're also extremely useful. They were first developed as an alternative to the elaborately ornate porcelain tea pots used in ceremonial celebrations centuries ago in China. Today, these clay teapots are among the most beloved tools for tea lovers.
Yixing teapots feature porous clay construction that absorbs the natural oils in tea. That means that over time, these teapots gradually absorb the flavor and hue of brewed tea.
Yixing teapots symbolize a return to humble, natural roots of tea. The teapot is made entirely of natural materials and artfully crafted by hand. Often passed down as family heirlooms, these teapots are stunning works of art and perfect for brewing tea with a cultural flair. Discover the simple elegance of a yixing teapot with this quick guide.” Source: https://senchateabar.com/blogs/blog/yixing-teapot?srsltid=AfmBOoqCwx3A86bcKuoNRD2LpSIvOlN8OygCoIjtA-xrS1NnvbsNj5Zh