Rabejacite found at Jachymov deposit (the Krusne hory Mts., Northern Bohemi
a, Czech Republic) has unit cell parameters a = 8.597(1), b = 16.684(3), c
= 15.852(4)Angstrom; the infrared spectrum proves the presence of structura
lly nonequivalent sulfate groups and the thermogravimetric analysis structu
rally nonequivalent water molecules in the crystal structure of rabejacite.