Robuta

https://pubchem.ncbi.nlm.nih.gov/compound/Ammonium-tungstosilicate-_NH4_4SiW12O40 Ammonium tungstosilicate ((NH4)4SiW12O40) - PubChem Ammonium tungstosilicate ((NH4)4SiW12O40) chemical information summary. ammoniumpubchem