| Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York. Bouška, V., Dvořák, Z.: Nerosty severočeské hěndouhelné pánve. Praha: Severočeské doly, a.s., 160 s. |