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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
Ringwoodite: Mg2SiO4 Lingunite: (Na,Ca)AlSi3O8 Majorite: Mg3(Fe,Al,Si)2(SiO4)3
Comments: BSE image showing chondritic xenoliths and impact melt veins of lingunite (Lgt). Olivine (Olv), pyroxene (Pyx), maskelynite (Ms glass), ringwoodite (Rgt), and majorite (Mjt). Meteoritics & Planetary Science 43, No 5, 823-828 (2008). Location: Polished thin section of the Sixiangkou meteorite. Scale: See Image. © Meteoritics & Planetary Science
Rinkite: Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2
Comments: Hexagonal prismatic crystals of rinkite in nepheline-syenite pegmatite matrix. Associated with orthoclase, black aegirine and minor eudialyte. Location: Takhtarvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Specimen Size 7x3.5x2.5 cm.. © Pavel M. Kartashov
Rinmanite: (Zn,Mn)2Sb2Mg2Fe4O14(OH)2
Comments: A. Specimen with carbonates (white), amphibole (reddish) and franklinite–rinmanite (dark spots). B. Same specimen illuminated with UV light (254 nm). Note the orange-red carbonate fluorescence. Location: Garpenberg Norra Zn-Pb mine, Hedemora, Dalarna, in south-central Sweden. (CanMin, v39:1675). Scale: Specimen Size 5 cm wide. © Canadian Mineralogist
Rinmanite: (Zn,Mn)2Sb2Mg2Fe4O14(OH)2 Franklinite: (Zn,Mn++,Fe++)(Fe+++,Mn+++)2O4
Comments: B&W image (reflected light) of a polished section of rinmanite and franklinite (white) with associated silicates. Location: Garpenberg Norra Zn-Pb mine, Hedemora, Dalarna, in south-central Sweden. (CanMin, v39:1675). Scale: Scale Bar 0.2 mm. © Canadian Mineralogist
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
Rittmannite: Mn++Mn++Fe++Al2(OH)2(PO4)4·8(H2O)
Comments: SEM image of rittmannite crystals on massive adularia. (CanMin, v27:447). Location: Found in altered phosphatic "nodules" from the Mangualde granitic pegmatite, Portugal. Scale: 240 X. © Canadian Mineralogist
Comments: Light yellow, opaque, microcrystalline rittmannite on matrix. Location: El Galineiro, Vigo, Pontevedra, Spain. Scale: Specimen Size 2.4 x 2.1 x 1.1 cm. © John Veevaert
Rivadavite: Na6MgB24O40·22(H2O)
Comments: Translucent white rivadavite nodule with some adhering earthy material. Location: Tincalayu, Salta Province, Argentina. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Riversideite: Ca5Si6O16(OH)2·2(H2O)
Comments: Opaque off-white finely fibrous riversideite veins in vesuvianite / grossular matrix. Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Robertsite: Ca6Mn+++9(PO4)9O6(H2O)6·3(H2O) Carbonate-hydroxylapatite: Ca5(PO4,CO3)3(OH) Apatite: Ca5(PO4)3(OH,F,Cl)
Comments: Black crystals of Robertsite on pink carbonate-hydroxylapatite. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Robinsonite: Pb4Sb6S13
Comments: Dark gray, prismatic-acicular crystals of robinsonite on white marble. Location: Pitone Quarry, Seravezza, Lucca, Italy. Scale: Picture size 2 cm. © Dave Barthelmy
Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5
Comments: Black cruciform twins of rockbridgeite on siderite. Location: Big Chief mine, Keystone, Pennington County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Rockbridgeite: (Fe++,Mn)Fe+++4(PO4)3(OH)5 Stewartite: Mn++Fe+++2(PO4)2(OH)2·8(H2O)
Comments: Pointed, brownish yellow stewartite crystals on massive, dark rockbridgeite. Location: Hagendorf, Bavaria, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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