Raite
Class : SilicatesSubclass : PhyllosilicatesCrystal system : OrthorhombicChemistry : Na3Mn3Ti0,25Si8O20(OH)2 10H2ORarity : Very rare
Size : µm / mm / cm / dm / m
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Ralstonite
Class : HalidesSubclass : OxyfluoridesCrystal system : CubicChemistry : NaxMgxAl2-x(F,OH)6 H2ORarity : Rare
Rameauite
Class : Oxides and hydroxidesSubclass : Uranyl hydroxidesCrystal system : MonoclinicChemistry : K2CaU6O20 9H2ORarity : Very rare
Rammelsbergite
Class : Sulfides and sulfosaltsSubclass : ArsenidesCrystal system : OrthorhombicChemistry : NiAs2Rarity : Rare
Ramsdellite
Class : Oxides and hydroxidesSubclass : OxidesCrystal system : OrthorhombicChemistry : MnO2Rarity : Uncommon
Rancieite
Class : Oxides and hydroxidesSubclass : Hydroxides and hydratesCrystal system : HexagonalChemistry : CaMn4O9 3H2ORarity : Rare
Raspite
Class : Sulfates, chromates, molybdatesSubclass : TungstatesCrystal system : HexagonalChemistry : PbWO4Rarity : Very rare
Rathite
Class : Sulfides and sulfosaltsSubclass : SulfosaltsCrystal system : MonoclinicChemistry : (Ag,Pb,Tl)3As5S10Rarity : Very rare
Rauenthalite
Class : Phosphates, arsenates, vanadatesSubclass : Hydrated arsenatesCrystal system : TriclinicChemistry : Ca3(AsO4)2 10H2ORarity : Very rare
Realgar
Class : Sulfides and sulfosaltsSubclass : SulfidesCrystal system : MonoclinicChemistry : AsSRarity : Fairly common
Reddingite
Class : Phosphates, arsenates, vanadatesSubclass : Hydrated phosphatesCrystal system : OrthorhombicChemistry : Mn3(PO4)2 3H2ORarity : Rare to very rare
Renardite
Class : Phosphates, arsenates, vanadatesSubclass : Uranyl phosphatesCrystal system : OrthorhombicChemistry : Pb(UO2)4(PO4)2(OH)4 7H2ORarity : Rare to very rare
Renierite
Class : Sulfides and sulfosaltsSubclass : SulfidesCrystal system : TetragonalChemistry : (Cu,Zn)11(Ge,As)2Fe4S16Rarity : Rare
Rhodizite
Class : Carbonates, nitrates, boratesSubclass : BoratesCrystal system : CubicChemistry : (K,Cs)Al4Be4(B,Be)12O28Rarity : Rare
Rhodochrosite
Class : Carbonates, nitrates, boratesSubclass : Anhydrous carbonatesCrystal system : TrigonalChemistry : MnCO3Rarity : Common
Rhodonite
Class : SilicatesSubclass : InosilicatesCrystal system : TriclinicChemistry : MnSiO3Rarity : Common
Rhomboclase
Class : Sulfates, chromates, molybdatesSubclass : Hydrated sulfatesCrystal system : OrthorhombicChemistry : HFe(SO4)2 4H2ORarity : Rare
Rhönite
Class : SilicatesSubclass : InosilicatesCrystal system : TriclinicChemistry : Ca2(Mg,Fe,Ti)6(Si,Al)6O20Rarity : Rare
Richelsdorfite
Class : Phosphates, arsenates, vanadatesSubclass : Hydrated arsenatesCrystal system : MonoclinicChemistry : Ca2Cu5Sb(AsO4)4(OH)6Cl 6H2ORarity : Rare
Riebeckite
Class : SilicatesSubclass : InosilicatesCrystal system : MonoclinicChemistry : Na2Fe5Si8O22(OH)2Rarity : Uncommon
Rockbridgeite
Class : Phosphates, arsenates, vanadatesSubclass : Anhydrous phosphatesCrystal system : OrthorhombicChemistry : MnFe4(PO4)3(OH)5Rarity : Fairly common
Roedderite
Class : SilicatesSubclass : CyclosilicatesCrystal system : HexagonalChemistry : (Na,K)2(Mg,Fe)5Si12O30Rarity : Very rare
Romanechite
Class : Oxides and hydroxidesSubclass : OxidesCrystal system : MonoclinicChemistry : (Ba,H2O)2Mn5O10Rarity : Quite common
Römerite
Class : Sulfates, chromates, molybdatesSubclass : Hydrated sulfatesCrystal system : TriclinicChemistry : Fe3(SO4)4 14H2ORarity : Rare to uncommon
Rosasite
Class : Carbonates, nitrates, boratesSubclass : Anhydrous carbonatesCrystal system : MonoclinicChemistry : (Zn,Cu)2(CO3)(OH)2Rarity : Uncommon
Roscoelite
Class : SilicatesSubclass : PhyllosilicatesCrystal system : MonoclinicChemistry : KV2AlSi3O10(OH)2Rarity : Uncommon
Roselite
Class : Phosphates, arsenates, vanadatesSubclass : Hydrated arsenatesCrystal system : MonoclinicChemistry : Ca2(Co,Mg)(AsO4)2 2H2ORarity : Very rare
Roubaultite
Class : Carbonates, nitrates, boratesSubclass : Uranyl carbonatesCrystal system : TriclinicChemistry : Cu2(UO2)3(CO3)2O2(OH)2 4H2ORarity : Very rare
Routhierite
Class : Sulfides and sulfosaltsSubclass : SulfosaltsCrystal system : TetragonalChemistry : (Tl,Cu,Ag)HgAsS3Rarity : Very rare
Rubellite
Class : SilicatesSubclass : CyclosilicatesCrystal system : TrigonalChemistry : Na(Al,Li)3Al6(BO3)3Si6O18(OH)4Rarity : Uncommon
Ruby
Class : Oxides and hydroxidesSubclass : OxidesCrystal system : TrigonalChemistry : Al2O3Rarity : Rare
Rutherfordine
Class : Carbonates, nitrates, boratesSubclass : Uranyl carbonatesCrystal system : OrthorhombicChemistry : UO2CO3Rarity : Uncommon
Rutile
Class : Oxides and hydroxidesSubclass : OxidesCrystal system : TetragonalChemistry : TiO2Rarity : Very common