Brown aggregates of the very rare organic mineral natroxalate from Chile (Pabellon de Pica, Chanabaya, Iquique Province, Tarapacá Region, Chile). Deliquescent. Ex. Erich Laskowski collection (USA). — Photo: David Hospital · CC BY 4.0
Natroxalate
Natroxalate is an IMA-recognized mineral species in the organic mineral class, with the chemical formula Na₂(C₂O₄).
It is a member of the Oxalate structural group.
Key properties: Mohs hardness 3; specific gravity 2.32; Vitreous luster; optically biaxial.
IMA symbol Nx, IMA status: approved, named in 1994.
Found in a hydrothermally altered pegmatite in a differentiated alkalic massif.
It is found associated with Aegirine, albite, elpidite, natron, nenadkevichite, taeniolite, sphalerite, pyrite, galena.
The name refers to sodium, natrium, in the composition, and as a naturally occurring oxalate.