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1 Eat fewer oxalate-rich foods. 2  If you tend to form calcium oxalate stones, your doctor may recommend restricting foods rich in oxalates. 3  These include rhubarb, beets, okra, spinach, Swiss chard, sweet potatoes, nuts, tea, chocolate and soy products.
Calcium oxalate (in archaic terminology, oxalate of lime) is a calcium salt of oxalic acid with the chemical formula CaC 2 O 4. It is a chemical compound that forms envelope-shaped crystals, known in plants as raphides.alcium and oxalate in the diet play a part, but are not the only factors that affect the formation of calcium oxalate stones. Dietary oxalate is an organic molecule found in many vegetables, fruits, and nuts. Calcium from bone may also play a role in kidney stone formation.