Manganese oxalate is an inorganic compound with the chemical formula . Solid samples are pale pink and insoluble in water. At least two hydrates have been observed. It occurs naturally as the mineral Lindbergite.
Exchange reaction between sodium oxalate and manganese chloride:
The dihydrate can also be prepared hydrothermally.
Manganese oxalate forms light pink crystals. The crystalline hydrates have the composition MnCOâ¢n HO, where n = 2 and 3. The dihydrate forms light pink crystals of the orthorhombic system, space group P2<sub>1</sub>2<sub>1</sub>2<sub>1</sub>, cell parameters a = 0.6262 nm, b = 1.3585 nm, c = 0.6091 nm, Z = 4, melts in its own crystallization water at 100 ðC.
It does not dissolve in water, pK<sub>sp</sub> = 6.8.
Manganese oxalate is a precursor various manganese oxides, such as MnO, , and . it decomposes at 215 ðC: