Zisha is generally harder than wood. Zisha, also known as Yixing clay, is a type of earthenware that is known for its dense and durable nature. It has a hardness rating of around 6.5 on the Mohs scale, which is a measure of mineral hardness. In contrast, wood typically ranges from 2.5 to 4 on the Mohs scale, depending on the type of wood. This significant difference in hardness makes Zisha more resistant to scratches, dents, and wear compared to wood. For instance, Zisha teapots are often used for brewing tea due to their ability to withstand the heat and maintain their shape over time, while wooden furniture can be more susceptible to damage from environmental factors and everyday use.