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Robertsite: Ca6Mn+++9(PO4)9O6(H2O)6·3(H2O) Carbonate-hydroxylapatite: Ca5(PO4,CO3)3(OH) Apatite: Ca5(PO4)3(OH,F,Cl)
Comments: Black crystals of Robertsite on pink carbonate-hydroxylapatite. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5
Comments: Black cruciform twins of rockbridgeite on siderite. Location: Big Chief mine, Keystone, Pennington County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Roscherite: Ca(Mn++,Fe++)5Be4(PO4)6(OH)4·6(H2O) Englishite: K3Na2Ca10Al15(PO4)21(OH)7·26(H2O)
Comments: Black crystalline aggregate of roscherite on white englishite. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Roselite-beta: Ca2(Co,Mg)(AsO4)2·2(H2O)
Comments: Clear, rose-colored roselite-beta crystalline grains. Location: Bou Azzer, Anti-Atlas Mountains, Morocco. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Rutherfordine: UO2(CO3)
Comments: Yellow, bladed crystals of rutherfordine. Location: Shinkolobwe Mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Sainfeldite: Ca5(AsO3OH)2(AsO4)2·4(H2O)
Comments: Rose-colored crystalline aggregate of Sainfeldite. Location: Wechsel Schacht, Richelsdorf, Hesse, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Salesite: Cu(IO3)(OH)
Comments: Blue, prismatic crystal of Salesite in matrix. Location: Chuquicamata, Antofagasta, Chile. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Samsonite: Ag4MnSb2S6
Comments: Black, prismatic crystal of samsonite in matrix. Location: St. Andreasberg, Harz, Lower Saxony, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Santaclaraite: CaMn++4Si5O14(OH)2·(H2O)
Comments: Flesh-colored crystalline aggregates of Santaclaraite. Location: Corral Hollow, Alemada County, California, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Sarkinite: Mn++2(AsO4)(OH)
Comments: Reddish brown crystalline aggregates of sarkinite on matrix. Location: Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals