This formation is a semiliquid, cheeselike material. It is considered a secondary formation which is found on the floors, walls, and ceilings of certain caves. It is similar to other deposits, but its unique quality is that it does not harden or turn to stone. Analysis of the materials reveals several minerals. The hypothesis about its origin is mixed.
Some scientists think it is a bacterial action rather than a chemical one.
Bacterial actions were capable of breaking down the stone to form this semiliquid state. Moon milk has also been discovered in a dry powder or granular form.