Complete mineralogical data for OTTRÉLITE. Chemical Formula: Mn2+Al2[SiO4]O(OH)2. Crystal System: Monoclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OTWAYITE. Chemical Formula: Ni2(CO3)(OH)2·H2O. Crystal System: Orthorhombic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OULANKAITE. Chemical Formula: Pd5Cu4SnTe2S2. Crystal System: Tetragonal. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OURAYITE. Chemical Formula: Pb4Ag3Bi5S13. Crystal System: Orthorhombic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OURSINITE. Chemical Formula: Co(UO2)2[SiO3OH]2(H2O)6. Crystal System: Orthorhombic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OVAMBOITE. Chemical Formula: Cu20Fe2+6W2Ge6S32. Crystal System: Isometric. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OVERITE. Chemical Formula: CaMgAl(PO4)2(OH)(H2O)4. Crystal System: Orthorhombic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OWENSITE. Chemical Formula: (Ba,Pb)6(Cu,Fe,Ni)25S27. Crystal System: Isometric. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OWYHEEITE. Chemical Formula: Pb10Ag3Sb11S28. Crystal System: Monoclinic. Learn about its geologic occurrence, habit, and identification.

Complete mineralogical data for OXAMMITE. Chemical Formula: (NH4)2[C2O4]·H2O. Crystal System: Orthorhombic. Learn about its geologic occurrence, habit, and identification.