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Realgar: AsS Rebulite: Tl5Sb5As8S22
Comments: Dark gray rebulite grain in red, massive realgar. Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Realgar: AsS Vrbaite: Tl4Hg3Sb2As8S20
Comments: Black grain of vrbaite in red realgar matrix. Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 1.7 mm. © Thomas Witzke / Abraxas-Verlag
Rebulite: Tl5Sb5As8S22 Realgar: AsS
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
Reichenbachite: Cu++5(PO4)2(OH)4
Comments: Green crystals of reichenbachite on quartz. Location: Bergen, near Falkenstein, Vogtland, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Rhabdophane-(Ce): (Ce,La)PO4·(H2O)
Comments: White acicular crystals rhabdophane-(Ce) on matrix. Location: Reinersreuth Quarry (Köhlerloch), Großer Waldstein, Weißenstadt, Fichtelgebirge, Bavaria, Germany. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag
Richelsdorfite: Ca2Cu5Sb(AsO4)4Cl(OH)6·6(H2O)
Comments: Greenish rounded aggregates of richelsdorfite on matrix. Location: Wilhelm Mine; Wechselschacht, near Bauhaus, Richelsdorf District, Hesse, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Rinneite: K3NaFe++Cl6 Carnallite: KMgCl3·6(H2O)
Comments: Orange to light brown rinneite with colorless carnallite. Location: Merkers, Bad Salzungen, Rhön, Thuringia, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
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
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
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
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
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
Roquesite: CuInS2
Comments: Polished section (PPL) showing bluish-gray, anhedral roquesite grains in violet-gray bornite, with blue covellite veinlets. Location: Charrier, Allier, France. Scale: Picture size 0.7 mm. © Thomas Witzke
Rorisite: (Ca,Mg)FCl
Comments: Colorless to white tabular crystals of Rorisite. Rorisite is extremely hygroscopic and must be stored in closed vials. The picture was made through the vial. Location: Kopeisk, Chelyabinsk Oblast', Urals Region, Russia. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Roscherite: Ca(Mn++,Fe++)5Be4(PO4)6(OH)4·6(H2O) Viitaniemiite: Na(Ca,Mn++)Al(PO4)(F,OH)3
Comments: Colorless to pink viitaniemiite with brownish roscherite. Location: Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Rosenbergite: AlF3·3(H2O)
Comments: Colorless prismatic crystals of rosenbergite on a dark matrix. Location: Cetine di Cotorniano Mine (Cetine Mine; Tafone Mine), Rosia, Siena, Tuscany, Italy. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag
Rosiaite: PbSb+++++2O6 Valentinite: Sb2O3
Comments: Beige crystals of rosiaite with a colorless valentinite prism. Location: Tafone Mine, Manciano, Grosseto, Tuscany, Italy. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag