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Rebulite: Tl5Sb5As8S22 Realgar: AsS
Comments: Dark gray rebulite grain in red, massive realgar. Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Rectorite: (Na,Ca)Al4(Si,Al)8O20(OH)4·2(H2O)
Comments: Blue Mountain District, Marble Township, Garland Co., Arkansas, USA. Location: Five pieces of leather-like fragments of rectorite in twisted, irregular shapes. Scale: Specimen size 1-4 cm. © John Betts - Fine Minerals
Reddingite: Mn++3(PO4)2·3(H2O)
Comments: Brown crystals of reddingite on matrix. Location: Boa Vista creek, Minas Gerais, Brazil. Scale: Crystal size 1 mm. © Sandro Maggia/Minernet.it
Comments: Opaque brown crystalline reddingite. Location: Tip Top Quarry, Custer County, South Dakota, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Golden brown to brown, highly lustrous, pseudo-octahedral crystals of reddinite. Location: Cigana mine, Galileia, Minas Gerais, Brazil. Scale: Crystal size 0.5 mm. © Tom Loomis / Dakota Matrix
Redgillite: Cu6(OH)10(SO4)·H2O
Comments: Light green acicular microcrystals of redgillite with unidentified blue Cu sulphate on matrix. Location: Grube Schone Aussicht, Siegerland, Germany. Scale: Picture size 2 mm. © Diederik Visser
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
Redledgeite: BaTi6Cr+++2O16·(H2O)
Comments: Red Ledge Mine, Washington, Washington District, Nevada Co., California, USA. Location: Green, massive redledgeite. Scale: Picture size 4.5 mm. © Thomas Witzke / Abraxas-Verlag
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