FormatNatrium natriumformat mengkristal dalam [[sistem kristal monoklinik]] dengan [[parameter kisi]] a = 6,19 Å, b = 6,72 Å, c = 6,49 Å and β = 121,7°.<ref name="Zachariasen">W. H. Zachariasen: "The Crystal Structure of Sodium Formate, NaHCO<sub>2</sub>" in ''[[J. Am. Chem. Soc.]]'', '''1940''', ''62''(5), S. 1011–1013. {{doi|10.1021/ja01862a007}}</ref>