9.CE.30g [no] Orickite (IMA1978-059) 2.FB.15 (IUPAC: copper iron disulfide monohydrate) Orientite (Y: 1921) 9.BJ.05 Orlandiite (selenite: IMA1998-038, IMA1998-035) 4.JH.20 (IUPAC: trilead tetrachlorine trioxoselenate(IV) monohydrate) Orlovite (mica: IMA2009-006) 9.EC.20 [no] [no] (IUPAC: potassium dilithium titanium undecaoxytetrasilicate fluoride) Orlymanite (IMA1988-029) 9.EE.30 Orpiment (orpiment: 1944) 2.FA.30 (IUPAC: trisulfa diarsenide) Orschallite (sulfite: IMA1990-041) 4.JE.15 (IUPAC: tricalcium disulfite sulfate dodecahydrate) Orthobrannerite (IMA1982 s.p., 1978) 4.DH.05 (IUPAC: uranium(IV) uranium(VI) tetratitanium dihydro dodecaoxide) Orthocuproplatinum (alloy: IMA2018-124) 1.0 [no] [no] (IUPAC: triplatinium copper alloy) Orthoclase (feldspar: IMA1962 s.p., 1823) 9.FA.30 (IUPAC: potassium (aluminium octaoxotrisilicate) Orthogersdorffite (gersdorffite-Pca21: 1982) 2.EB.25 [no] [no] Orthojoaquinite (joaquinite) 9.CE.25 Orthojoaquinite-(Ce) (IMA1979-081b) 9.CE.25 Orthojoaquinite-(La) (IMA2000-D) 9.CE.25 Orthominasragrite (minasragrite: IMA2000-018) 7.DB.20 (IUPAC: vanadium(IV) oxosulfate pentahydrate) Orthopinakiolite (orthopinakiolite: IMA1962 s.p., 1960) 6.AB.40 (IUPAC: dimagnesium manganese(III) dioxo(trioxoborate)) Orthoserpierite (IMA1983-022a) 7.DD.30 (IUPAC: calcium tetracopper hexahydro disulfate trihydrate) Orthowalpurgite (IMA1994-024) 8.EA.05 (IUPAC: uranyl tetrabismuth tetraoxo diarsenate dihydrate) Osakaite (ktenasite: IMA2006-049) 7.DE.40 (IUPAC: tetrazinc hexahydro sulfate pentahydrate) Osarizawaite (alunite, alunite: IMA1987 s.p., 1961 Rd) 7.BC.10 (IUPAC: lead (dialuminium copper(II)) hexahydro disulfate) Osarsite (arsenopyrite: IMA1971-025) 2.EB.20 (IUPAC: osmium sulfarsenide) Osbornite (nitride: 1870) 1.BC.15 (IUPAC: titanium nitride) Oscarkempffite (lillianite: IMA2011-029) 2.0 [no] [no] (Ag10Pb4(Sb17Bi9)S48) Oskarssonite (perovskite: IMA2012-088) 3.0 [no] (IUPAC: aluminium trifluoride) Osmium (element: IMA1991 s.p., 1804 Rd) 1.AF.05 Osumilite (milarite) 9.CM.05 Osumilite (1953) 9.CM.05 (IUPAC: potassium diiron (pentalumino decasilicate) triacontaoxy) Osumilite-(Mg) (IMA2011-083) 9.CM.05 (IUPAC: potassium dimagnesium trialuminium (dialuminodecasilicate) triacontaoxy) Oswaldpeetersite (IMA2000-034) 5.EA.20 (IUPAC: diuranyl dihydro carbonate tetrahydrate) Otavite (calcite: 1842) 5.AB.05 (IUPAC: cadmium carbonate) Otjisumeite (IMA1978-080) 9.J0.15 (IUPAC: lead tetragermanium nonaoxide) Ottemannite (IMA1968 s.p., 1966) 2.DB.10 (IUPAC: ditin trisulfide) Ottensite (IMA2006-014) 2.MA.05 [no] (IUPAC: trisodium tri(trioxodiantimony) (trisulfa antimonide) trihydrate) Ottohahnite (IMA2015-098) 7.0 [no] [no] (IUPAC: dodecasodium tetrauranyl decasulfate tetradecawater trihydrate) Ottoite (lead-tellurium oxysalt: IMA2009-063) 7.0 [no] [no] (IUPAC: dilead tellurium pentaoxide) Ottrélite (Y: 1842) 9.AF.85 (IUPAC: manganese(II) dialuminium dihydroxide oxide silicate) Otwayite (IMA1976-028) 5.DA.15 (IUPAC: dinickel dihydroxide carbonate monohydrate) Oulankaite (IMA1990-055) 2.BC.40 (IUPAC: pentalead tetracopper tin disulfide ditelluride) Ourayite (lillianite: IMA1976-007) 2.JB.40c (Ag3Pb4Bi5S13) Oursinite (IMA1982-051) 9.AK.10 (IUPAC: cobalt diuranyl di(hydrotrioxosilicate) hexahydrate) Ovamboite (germanite: IMA1992-039) 2.CB.30 [no] (Cu10Fe3WGe3S16) Overite (overite: 1940) 8.DH.20 (IUPAC: calcium magnesium aluminium hydroxide diphosphate tetrahydrate) Owensite (IMA1993-061) 2.FC.05 () Owyheeite (Y: 1920) 2.HC.35 (Ag3Pb10Sb11S28) Oxammite (oxalate: 1870) 10.AB.55 (IUPAC: diammonium oxalate monohydrate) Oxo-magnesio-hastingsite [Ca-amphibole: IMA2011-035] 9.D?. [no] [no] Oxo-mangani-leakeite [Na-amphibole: IMA2015-035] 9.D?. [no] [no] Oxybismutomicrolite (pyrochlore: IMA2019-047) 4.0 [no] [no] Oxycalciopyrochlore (pyrochlore: IMA2010 s.p., IMA1978-052 Rd) 4.0 (IUPAC: dicalcium diniobium hexaoxide oxide) Oxycalciomicrolite (pyrochlore: IMA2019-110) 4.0 [no] [no] Oxycalcioroméite (pyrochlore: IMA2012-022) 4.0 [no] [no] (IUPAC: dicalcium diantimony(V) heptaoxide) Oxy-chromium-dravite