Min. [f. as prec.; named by A. Scacchi in 1840.] A hydrous sulphate of iron occurring in green, black or brown crystals.
1846. Worcester (citing Dana).
1852. Dana, Min., 228. Voltaite is a double sulphate of iron, alumina, potash and water crystalising like alum in octahedrons.
1868. Watts, Dict. Chem., V. 1005. Voltaite, a ferroso-ferric sulphate, containing alumina, occurring at the Solfatara, near Naples.
