The stone sulfur is a subtropical gastropod shellfish with an oval or oval body. The adult body is about 6.0cm long and 3.7cm wide. The average weight is 14g. The whole body is naked and shellless. The surface is blue-blue, gray mixed with green and brown. It is densely covered with numerous tumor-like and dendritic protrusions, and has numerous black dorsal eyes. The dorsal eyes are very sensitive to light and look like toads or earth bumps. Stone sulfur is widely distributed in the estuary waters along the Indo-Pacific coast. In China, it is mostly distributed in the East China Sea and the South China Sea, with a large amount of resources.

Stone sulfur has extremely high nutritional value and nourishing functions. Folklore in some coastal areas says that stone sulfur can cure asthma, aid digestion, relieve fatigue, and improve eyesight. Stone sugar stewed with rock sugar is said to have special effects on treating asthma, and is often used as a good tonic for postpartum pregnant women. Folks in Wenzhou and Longquan in Zhejiang, Yancheng and Nantong in Jiangsu, Fuan in Fujian, and Nanhui in Shanghai have the habit of eating stone sulfur fresh or dry, and regard it as a tonic and seafood treasure. Blanch the fresh stone sulfur in boiling water, peel off the leathery skin of the mantle, cut open the abdomen, discard the internal organs, wash the mucus with salt or plant ash, then cut the meat into shreds, add seasonings and stir-fry it. It is made into various delicious dishes and is deeply loved by the masses.

The method of eating can be stewed, braised, or wrapped in thin flour and fried, but the cooking time should not be too long.