's Image Gallery

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

Rondorfite: Ca8Mg(SiO4)4Cl2

Comments: Brown to orange, shiny, massive rondorfite in matrix.
Location: Bellerberg, Eifel, Germany. Scale: Not Given.
© Diederik Visser

Rondorfite: Ca8Mg(SiO4)4Cl2  
Kumtyubeite: Ca5(SiO4)2F2  
Srebrodolskite: Ca2Fe+++2O5  
Wadalite: Ca6Al5Si2O16Cl3

Comments: BSE image of kumtyubeite (Kmt) associated with srebrodolskite (Srb), bultfonteinite (Blt), Ca- kydrosilicates, wadalite (Wad), rondorfite (Rndr), and ettringite (dark gray). (AmMin, v94:1361).
Location: Rock-forming mineral found in skarn carbonate-xenoliths in ignimbrites of the Upper Chegem volcanic structure, Kabardino-Balkaria, Northern Caucasus, Russia. Scale: See Image.
© American Mineralogist

Ronneburgite: K2MnV4O12

Comments: Reddish-brown crystals of ronneburgite on matrix.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Rontgenite-(Ce): Ca2(Ce,La)3(CO3)5F3

Comments: Gemmy and lustrous rontgenite-(Ce) crystals to 1.5 mm on an albite matrix.
Location: Narsarsuk, Igaliko, Greenland. Scale: 3.7 x 1.5 cm.
© John Veevaert

Rontgenite-(Ce): Ca2(Ce,La)3(CO3)5F3  
Thorbastnasite: Th(Ca,Ce)(CO3)2F2·3(H2O)

Comments: Tny white, acicular thorbastnasite crystals to less than 1 mm in sprays. The thorbastnasite forms the cores the 'needles', with white epitaxial rontgenite-(Ce) coating.
Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Needle Size < 1 mm.
© William Lechner / Dakota Matrix

Rooseveltite: BiAsO4

Comments: Gray glassy crystalline rooseveltite with purple fluorite.
Location: Josef Fluorite Mine, Krune Hora Mountains, near Teplice, Seversocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species