It's possible because the mycelium produces oxalic acids, and many other acids and enzymes, pockmarking rock and grabbing calcium and other minerals and forming calcium oxalates.
Itu mungkin karena miselium menghasilkan asam oksalat dan banyak asam dan enzim lain, melubangi batu dan mengambil kalsium dan mineral lain dan membentuk kalsium oksalat.