Mineral Specimen Images (R)

Riversideite: Ca5Si6O16(OH)2·2(H2O)

Comments: Opaque off-white finely fibrous riversideite veins in vesuvianite / grossular matrix.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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

Robinsonite: Pb4Sb6S13

Comments: Dark gray, prismatic-acicular crystals of robinsonite on white marble.
Location: Pitone Quarry, Seravezza, Lucca, Italy. Scale: Picture size 2 cm.
© Dave Barthelmy

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

Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5  
Wilhelmvierlingite: CaMn++Fe+++(PO4)2(OH)·2(H2O)

Comments: Yellow brown crystals wilhelmvierlingite with black rockbridgeite.
Location: Hagendorf South Pegmatite (Cornelia Mine; Hagendorf South Open Cut), Waidhaus, Vohenstrauß, Oberpfalz, Bavaria, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5  
Tinsleyite: KAl2(PO4)2(OH)·2(H2O)  
Phosphosiderite: Fe+++PO4·2(H2O)

Comments: Violet botryoidal tinsleyite on bluish-purple botryoidal phosphosiderite on dark, massive rockbridgeite.
Location: Bendada, Guarda, Portugal. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5  
Lindbergite: Mn(C2O4)·2(H2O)

Comments: Rare organic mineral - lindbergite (Mn dihydrate oxalate) in white patches on rockbridgeite matrix.
Location: Boca Rica mine, Sapucaia do Norte, Gilileia, Minas Gerais, Brazil. Scale: Spot size 1 mm.
© Tom Loomis / Dakota Matrix

Rodalquilarite: H3Fe+++2(Te++++O3)4Cl

Comments: Green crystals of rodalquilarite on matrix.
Location: Tombstone, Tombstone District, Cochise Co., Arizona, USA. Scale: Picture size 4 m.
© Thomas Witzke / Abraxas-Verlag

Rodalquilarite: H3Fe+++2(Te++++O3)4Cl  
Schieffelinite: Pb(Te++++++,S)O4·(H2O)

Comments: Creamy white Schieffelinite with minor green rodalquilarite.
Location: Tombstone, Tombstone District, Cochise Co., Arizona, USA. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Rodolicoite: Fe+++PO4  
Grattarolaite: Fe+++3O3(PO4)

Comments: Brown grattarolaite, intimately intergrown with brown rodolicoite.
Location: Castelnuovo Mine, Santa Barbara lignite district, San Giovanni Valdarno, Valdarno (Val d'Arno), Arezzo Province, Tuscany, Italy. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Roeblingite: Pb2Ca6(Si6O18)(SO4)2(OH)2·4(H2O)

Comments: Pure white opaque porcelaneous roeblingite mass.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Roedderite: (Na,K)2(Mg,Fe++)5Si12O30

Comments: Deep green transparent roedderite microcrystal.
Location: Bellerberg, Eifel, Rheinland-Pflaz, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Roggianite: Ca2[Be(OH)2Al2Si4O13]·<2·5(H2O)

Comments: Glassy white fibrous roggianite aggregate.
Location: Murzinka, Sverdlovsk District, Middle Urals, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rokuhnite: Fe++Cl2·(H2O)  
Carnallite: KMgCl3·6(H2O)

Comments: Reddish brown rokuhnite, with carnallite (deliquescent).
Location: Salzdetfurth Mine, Hildesheim, near Hanover, Niedersachsen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Romanechite: (Ba,H2O)2(Mn++++,Mn+++)5O10

Comments: Black botryoidal romanèchite.
Location: Callenberg North (no. 2) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Specimen size 9 mm.
© Thomas Witzke / Abraxas-Verlag

Romanite: (Fe++,U,Pb)2(Ti,Fe+++)O4

Comments: Black, massive coarse-grained aggregate of romanite from amphibolites and its radioactivity is 335 µR/h.
Location: Dzhigda U ore occurrence, Dambuki ore cluster, Amurskaya Oblast', Far-Eastern Region, Russia. Scale: Specimen Size 3x2x1.8 cm.
© Pavel M. Kartashov

Romarchite: SnO

Comments: SEM photograph of romarchite precipitating on quartz sand grains on the surface of a pewter artifact. (Geoarchaeology, 19:538).
Location: Wreck of the Queen Anne’s Revenge (A.D. 1718). Scale: Scale Bar 30 µm.
© Geoarchaeology

Romeite: (Ca,Fe++,Mn,Na)2(Sb,Ti)2O6(O,OH,F)

Comments: Tan fibrous romeite on quartz.
Location: Sant Marcel, Piemonte, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Romerite: Fe++Fe+++2(SO4)4·14(H2O)

Comments: Massive, pale reddish-brown Römerite.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Specimen size 5.8 cm.
© Thomas Witzke / Abraxas-Verlag