 It is also noted for its bizarre occurrences, which include inside the otoliths of the tiger shark,
the bladder of a guinea pig, the calcareous corpuscles of a cestode parasite, and the final stages of decomposition of the putrefying flesh of the giant saguaro cactus.These occurrences suggest
a biochemical origin is possible.Monohydrocalcite forms via a Mg-rich amorphous calcium carbonate (ACC) precursor.