The Calcium oxalate (CaOx), a biomineral occurs in both plant and the animal kingdom. Calcium oxalate also has a commercial importance; it is used as filler and a pigment in coated paper and the cardboard industry to impart brightness. Three hydrate forms of Calcium oxalate which are crystallized in different morphologies and the natural occurrence is connected with the three minerals whewellite as monoclinic monohydrate (COM), weddilite as orthorhombic dehydrate (COD) and caoxite as triclinic trihydrate. A study based on homogeneous precipitation indicates that many parameters like relative super saturation, pH, precipitation time, stirring affect the calcium oxalate hydrate forms and their morphology.