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Piemontite: Ca2(Al,Mn,Fe)3(SiO4)3(OH) = Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH)
Comments: Red, acicular crystalline aggregates of piemontite. Location: N'Chwaning mine, Kuruman, Nothern Cape, South Africa. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Plumbogummite: PbAl3(PO4)2(OH)5·(H2O) Mimetite: Pb5(AsO4)3Cl
Comments: White, fuzzy aggregates of plumbogummite covering lime green mimetite (campylite) crystals. Location: Caldbeck Fells, Cumbria, England. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Posnjakite: Cu4(SO4)(OH)6·(H2O)
Comments: Waxy blue aggregates of posnjakite. Location: Ecton mine, Audubon, Montgomery County, Pennsylvania, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Pseudobrookite: (Fe+++,Fe++)2(Ti,Fe++)O5
Comments: Black, prismatic crystals of pseudobrookite on matrix. Location: Sierra County, New Mexico, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Pseudolaueite: Mn++Fe+++2(PO4)2(OH)2·7-8(H2O)
Comments: Brownish yellow crystals of pseudolaueite. Location: Hagendorf, Bavaria, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Pyrochroite: Mn(OH)2
Comments: Pseudo-cubic crystal of pyrochroite on matrix. Location: Franklin, Sussex County, New Jersey, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Pyrostilpnite: Ag3SbS3
Comments: Reddish brown, crystalline aggregate of pyrostilpnite on matrix. Location: St. Audreasberg, Hartz, Lower Saxony, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Raspite: PbWO4
Comments: Brown, tabular crystal of raspite on matrix. Location: Broken Hill, New South Wales, Australia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Renardite: Pb(UO2)4(PO4)2(OH)4·7(H2O)
Comments: Bright yellow, tabular crystals of renardite on matrix. Location: Grury, Saone-et-Loire, France. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Rhodochrosite: MnCO3 Helvite: Mn4Be3(SiO4)3S
Comments: Yellow crystals of helvite on quartz and pink rhodochrosite. Location: Galerie Elisabeth, Cavnic, Maramures, Romaina. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Rhonite: Ca2(Mg,Fe++,Fe+++,Ti)6(Si,Al)6O20
Comments: Brown, striated, tabular crystal of rhonite on matrix. Location: Sattleberg, Laacher See, Rhineland-Pal., Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5 Stewartite: Mn++Fe+++2(PO4)2(OH)2·8(H2O)
Comments: Pointed, brownish yellow stewartite crystals on massive, dark rockbridgeite. Location: Hagendorf, Bavaria, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Roscherite: Ca(Mn++,Fe++)5Be4(PO4)6(OH)4·6(H2O) Hurlbutite: CaBe2(PO4)2
Comments: White, round crystal clusters of hurlbutite on reddish brown roscherite. Location: Tip Top mine, Custer, Custer 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
Rutherfordine: UO2(CO3) Wyartite: Ca3U++++(UO2)6(CO3)2(OH)18·3-5(H2O)
Comments: Brown, acicular wyartite crystals next to bright yellow rutherfordine tufts. Location: Shinokolbwe 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