Pig sand is definitely not cinnabar. Pig sand is a kind of red stone formed by gallbladder disease of pigs raised for many years. Pigs with this disease don't like to eat, they are thin and small, and they don't grow up for more than a year. This pig may produce pig sand. Pig sand is used in ancient Taoist paintings, saying that it can ward off evil spirits and can also be used as medicine, which is much more expensive than the so-called cinnabar. There's nothing.
My grandfather used to have a pig at home. He kept it for almost a year, and the pig didn't grow. He is weak and doesn't like to eat. When he killed it, he shed bright red material. Later, he learned that pigs formed pig sand. If he didn't kill him, he would be valuable if he kept it for two years. As a result, he was killed as soon as it formed.