Complete mineralogical data for OKHOTSKITE. Chemical Formula: Ca2Mn2+Mn3+2[Si2O7][SiO4](OH)2(H2O). Crystal System: Monoclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OKIEITE. Chemical Formula: Mg3(V10O28)(H2O)18·10H2O. Crystal System: Triclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OKRUGINITE. Chemical Formula: Cu2SnSe3. Crystal System: Monoclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OKRUSCHITE. Chemical Formula: Ca2Mn2+5Be4(AsO4)6(OH)4(H2O)2·4H2O. Crystal System: Monoclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OLDHAMITE. Chemical Formula: CaS. Crystal System: Isometric. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OLDSITE. Chemical Formula: K2Fe2+(UO2)2(SO4)4(H2O)2·6H2O. Crystal System: Orthorhombic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for ODINTSOVITE. Chemical Formula: K2Na4Ca3Ti2Be4[Si6O18]2O2. Crystal System: Orthorhombic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OENITE. Chemical Formula: CoSbAs. Crystal System: Orthorhombic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OFFRETITE. Chemical Formula: KCaMg[Si13Al5O36]·15H2O. Crystal System: Hexagonal. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OFTEDALITE. Chemical Formula: K(ScCa)□2Be3[Si12O30]. Crystal System: Hexagonal. Learn about its geologic occurrence, habit, and identification.