Complete mineralogical data for ORLANDIITE. Chemical Formula: Pb3(Se4+O3)Cl4·H2O. Crystal System: Triclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for ORLOVITE. Chemical Formula: KLi2Ti[Si4O10](OF). Crystal System: Monoclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for ORLYMANITE. Chemical Formula: Ca4Mn2+3[Si8O20](OH)6·2H2O. Crystal System: Hexagonal-Trigonal. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for ONDRUŠITE. Chemical Formula: CaCu4(AsO3OH)2(AsO4)2·10H2O. Crystal System: Triclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for ONEILLITE. Chemical Formula: Na15Ca3Mn2+3Fe3Zr3NbSi[Si3O9]2[Si9O27]2(O,OH,H2O)4(OH,Cl)2. Crystal System: Hexagonal-Trigonal. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for ONORATOITE. Chemical Formula: Sb8Cl2O11. Crystal System: Monoclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OOSTERBOSCHITE. Chemical Formula: (Pd,Cu)7Se5. Crystal System: Orthorhombic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for Ootannite. Chemical Formula: Th4+2(WO4)4·5H2O. Crystal System: Monoclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OPAL. Chemical Formula: SiO2·nH2O. Crystal System: Amorphous. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OPHIRITE. Chemical Formula: Ca2Mg4Zn2Mn3+2(Fe3+W9O34)2(H2O)2·46H2O. Crystal System: Triclinic. Learn about its geologic occurrence, habit, and identification.