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Ribbeite: (Mn++,Mg)5(SiO4)2(OH)2
Comments: Massive pink to creamy ribbeite; slabbed polished section. Location: South-Fayulinskoe Deposit, Southern Ural, Russia. Scale: Not Given. © Diederik Visser
Richellite: Ca3Fe+++10(PO4)8(OH)12·n(H2O)
Comments: Khaki-colored earthy richellite masses. Location: Richelle, near Vise, Liege, Belgium. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Richetite: PbU++++++4O13·4(H2O)
Comments: Brown plates of richetite. Location: Shinkolobwe mine, Katanga, Congo. Scale: See Image. © Rruff Database
Richterite: Na(CaNa)(Mg,Fe++)5[Si8O22](OH)2 Calzirtite: CaZr3TiO9 Augite: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6
Comments: Gray irregular grain of calzirtite (see arrow) in fibrous augite with dark red richterite. Location: Jacupiranga Mine, Cajati, Sao Paulo, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Richterite: Na(CaNa)(Mg,Fe++)5[Si8O22](OH)2
Comments: Richterite crystal in tan calcite. Location: Bancroft, Ontario, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rickardite: Cu7Te5 Cameronite: AgCu7Te10 Vulcanite: CuTe
Comments: Gray metallic massive cameronite showing subconchoidal fracture associated with purple rickardite and bronzy plates of vulcanite in a mass of tellurium, co-type specimen. Location: Good Hope mine, Vulcan District, Gunnison County, Colorado, USA. Scale: See Image. © Rruff Database
Riebeckite: [ ]Na2(Fe++3Fe+++2)Si8O22(OH)2
Comments: Grayish black, coniform, massive crystals of riebeckite. Location: Cape Province, South Africa. Scale: 8x6 cm. © Dave Barthelmy
Rilandite: (Cr,Al)6SiO11·5(H2O) (?)
Comments: Dark brown opaque resinous rilandite cleavage fragment. Location: J. L. Riland Claim, near Meeker, Rio Blanco County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rimkorolgite: Mg5Ba(PO4)4·8(H2O)
Comments: Pinkish flesh-colored crystals of rimkorolgite in matrix. Location: Kovdor Massif, Kola Peninsula, Russia. Scale: Specimen Size 25x17x8 mm. © Sergey Vasiliev / Systematic Mineralogy