Lanthanoid, Rare earth, Orthorhombic, Pls

• Ca-Eu-O-Sn
• Ca-O-Pr-Ti
• B-Ca-Eu-Na-O
• Bi-Eu-K-Mo-O-P-W
• Dy-Eu-Gd-Mo-O
• rare earth
• lanthanoid
• luminescent
• chalcogen
• nonmetal