The headless stone originated from the ocean belongs to coral skeleton stone, which is often seen on the beaches in the south. Excellent water absorption, suitable for planting calamus and water-loving plants. It grows a variety of plants, and is mostly used to put ornamental stones in fish tanks. It is a hobby of feng shui rockery.
Pumice refers to the minerals formed by cooling magma after volcanic eruption. Its main component is silicon dioxide, which is soft in texture and low in specific gravity, so it is called pumice.