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Raite: Na4Mn++4Si8(O,OH)24·9(H2O) Mountainite: (Ca,Na2,K2)2Si4O10·3(H2O)
Comments: Bright white fibrous acicular mountainite crystal aggregate with pale golden raite. Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rambergite: MnS
Comments: Dark reddish-brown rambergite mass in matrix. Location: Ronneberg, Thuringen, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rammelsbergite: NiAs2
Comments: Dull gray metallic botryoidal rammelsbergite aggregate with crystalline surface. Location: Hudson Bay Mine, Rusty Lake, Gowganda, Ontario, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rancieite: (Ca,Mn++)Mn++++4O9·3(H2O)
Comments: Brown resinous rancieite veinlets in limonite / wad rock. Location: Montmirat, Lozere, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rasvumite: KFe2S3
Comments: Opaque dull orange fibrous rasvumite masses. Location: Coyote Peak, Humboldt County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rathite: Pb8Pb4-x(Tl2As2)x(Ag2As2)As16S40
Comments: Gray metallic foliated rathite, with pyrite in sugary dolomite. Location: Lengenbach Quarry, Binnental, Valais, Switzerland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rauenthalite: Ca3(AsO4)2·10(H2O)
Comments: Bright white botryoidal to transparent colorless prismatic rauenthalite microcrystals. Location: Gabe Gottes, Sainte-Marie-aux-Mines, Alsace, Haute-Rhin, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rauvite: Ca(UO2)2V+++++10O28·16(H2O)
Comments: Brownish-yellow scaly rauvite on sandstone. Location: Monument Valley, Apache County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Reddingite: Mn++3(PO4)2·3(H2O)
Comments: Opaque brown crystalline reddingite. Location: Tip Top Quarry, Custer County, South Dakota, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Redingtonite: (Fe++,Mg,Ni)(Cr,Al)2(SO4)4·22(H2O) Botryogen: MgFe+++(SO4)2(OH)·7(H2O)
Comments: Pale pink granular redingtonite on yellow-brown botryogen. Location: Redington Mine, Knoxville, Napa County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Reedmergnerite: NaBSi3O8
Comments: Peach colored crystalline reedmergnerite in quartz. Location: Dara-Pioz, Tien-Shan, Tadzhikistan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Reevesite: Ni6Fe+++2(CO3)(OH)16·4(H2O)
Comments: Green reevesite coatings on serpentinite rock. Location: Pacific Asbestos Corporation Mine, near Copperopolis, Tuolumne County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Reinhardbraunsite: Ca5(SiO4)2(OH,F)2 Brownmillerite: Ca2(Al,Fe+++)2O5
Comments: Pink crystalline reinhardbraunsite in brownmillerite. Location: Near Bellerberg, Eifel, Rheinland-Pflaz, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Renierite: (Cu,Zn)11(Ge,As)2Fe4S16
Comments: Dull dark orange tarnished renierite with brassy chalcopyrite. Location: Prince Leopold Mine, Kipushi, Shaba, Zaire. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Retgersite: NiSO4·6(H2O)
Comments: Pale blue powdery retgersite on rock. Location: Mina La Motte, near Frederocktown, Madison County, Missouri, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Retzian-(Nd): Mn2(Nd,Ce,La)(AsO4)(OH)4
Comments: Small crystal fragment of brown-orange retzian-(Nd), mounted on paper. Location: Sterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA. Scale: Not Given. © Jeff Weissman / Photographic Guide to Mineral Species
Rhenium: Re
Comments: Dark gray metallic rhenium flakes. Location: Transbaikalia Region, Chita District, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rhodesite: KHCa2Si8O19·5(H2O) Magadiite: NaSi7O13(OH)3·4(H2O)
Comments: Earth pale tan massive magadiite with dark yellow crystalline rhodesite. Location: East Fork, Trinity River, Trinity County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rhodesite: KHCa2Si8O19·5(H2O)
Comments: Pearly white to tan rhodesite crusts. Location: Quarter-mile east of Trinity River, Trinity County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rhodonite: (Mn++,Fe++,Mg,Ca)SiO3 Akatoreite: (Mn++,Fe++)9Al2Si8O24(OH)8
Comments: Brown akatoreite in pink rhodonite. Location: Akatore Creek, Eastern Otago Peninsula, South Island, New Zealand. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species