Chalcogen, Quaternary, Kemmler sack, Structural properties

• Ba-Gd-O-U
• Ba-O-U-Y
• Ba-Eu-O-U
• Ba-Dy-O-U
• Ba-Ho-O-U
• quaternary
• chalcogen
• oxide
• alkaline
• rare earth
• cubic
• trigonal
• hexagonal
• orthorhombic
• tetragonal