Oxides
Compounds of oxygen with metals. Includes important gem minerals like corundum (ruby, sapphire), chrysoberyl (alexandrite), spinel, and hematite.
6Gemstones
7Mineral Species
Strunz Class
4
Dana Class
4-7
Mineral Species in Oxides
Cassiterite
SnO₂
Tetragonal system
Chrysoberyl
BeAl₂O₄
Orthorhombic system
Corundum
Al₂O₃
Trigonal system
Hematite
Fe₂O₃
Trigonal system
Musgravite
BeMg₂Al₆O₁₂
Trigonal system
Spinel
MgAl₂O₄
Cubic system
Taaffeite
BeMgAl₄O₈
Hexagonal system





