👉 Tufa is a type of volcanic rock that forms in the Earth's surface and can vary depending on the location. The term "tufa" refers to the dense, black, and hard layer that often appears on the surface of volcanoes or other geological formations. It is composed primarily of silt and clay particles that have been compressed by high pressure during volcanic eruptions. Tufa has a distinctive appearance due to its black color and rough texture, which can be seen as a