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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
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
Rosickyite: S
Comments: Orange selenian rosickyite (containing 48.9 wt-% Se). Location: Lichtenberg Mine, Ronneburg U Deposit, Gera district, Thuringia, Germany. Scale: Picture size 8 mm. © Thomas Witzke / Abraxas-Verlag
Rosslerite: Mg(AsO3OH)·7(H2O)
Comments: Colorless crystals of rösslerite. Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 3.5 mm. © Thomas Witzke / Abraxas-Verlag
Rostite: AlSO4(OH,F)·5(H2O)
Comments: White crystals of rostite on a dark matrix. Location: Alsdorf, Aachen, North Rhine-Westphalia, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Russellite: Bi2WO6
Comments: Pale yellowish beige veinlet and thin crusts of russellite. Location: Himmelfahrt Mine, Steinbach, Johanngeorgenstadt, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Sabieite: (NH4)Fe+++(SO4)2
Comments: Massive, porous aggregate of sabieite. Location: Carola Mine, Freital, Dresden, Saxony, Germany. Scale: Picture size 4.5 cm. © Thomas Witzke / Abraxas-Verlag
Sakuraiite: (Cu,Zn,Fe,In,Sn)4S4
Comments: Dark gray sakuraiite ore. Location: Ikuno Mine, Kanagase, Asago-Gun-Hyogo, Japan. Scale: Specimen Size 2 cm. © Thomas Witzke