#Snails are gastropods. soft-bodied animals that use their stomachs to walk, and are part of the phylum Mollusca.

Please note, biomineralization is a process carried out by living organisms to produce minerals that aim to harden their body tissues.
The shell glands that snails have will secrete the organ matrix of proteins, carbohydrates, and lipids which serve as the basis for the mineral shell part of the shell.
The mineral shell is made of calcium carbonate.

In contrast to the skeletal structure of mammals, mollusk shells can contain the mineral or calcium carbonate as much as 95 to 99 percent of the total weight of the shell.
The rest, which is only about 1 to 5 percent, consists of organic matter. That's why a snail's shell can biologically turn into stone.

In contrast to the skeletal structure of mammals, mollusk shells can contain the mineral or calcium carbonate as much as 95 to 99 percent of the total weight of the shell.

The rest, which is only about 1 to 5 percent, consists of organic matter. That's why a snail's shell can biologically turn into stone.