Apatite, Chalcogen, Rare earth, Fusion

• La-O-Si-Sr
• Ge-La-O-Sr
• Ca-La-O-Si
• Co-La-O-Si
• Ga-La-O-Si
• temperature for congruent melting
• rare earth
• apatite
• chalcogen
• disordered
• hexagonal
• trigonal
• monoclinic