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Revdite: Na2Si2O5·5(H2O)
Comments: Transparent crystal fragment of revdite photographed through a capsule. Location: Mt. Alluaiv, Lovozero, Kola, Russia. Scale: Not Given. © Diederik Visser
Reyerite: (Na,K)4Ca14Si22Al2O58(OH)8·6(H2O)
Comments: Micaceous white plates of reyerite in cavity in basalt. Location: Drynoch near Carbost, Isle of Skye, Scotland. Scale: Specimen Size 1.5x2 cm. © Diederik Visser
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
Rhabdophane-(La): (La,Ce)PO4·(H2O)
Comments: Analcime crystal covered with rhabdophane-(La) crystals with black aegirine. Location: Demix Quarry, Mont St Hilaire, Quebec, Canada. Scale: Crystal Size to 2cm. © Adam Larson
Rheniite: ReS2
Comments: Specimen covered with rheniite as micro crystals to .25 mm across. Location: Kudryaviy Volcano, Iturup Island, Kurilian Chain, Russia. Scale: 4.7 x 3 cm. © John Veevaert
Rhenium: Re
Comments: Dark gray metallic rhenium flakes. Location: Transbaikalia Region, Chita District, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rhodarsenide: (Rh,Pd)2As
Comments: BSE image of dark gray metallic inclusion of rhodarsenide in sperrylite and Os,Ir,Ru matrix. Inset images show detail BSE and epoxy grain mount. Location: Miass River, Urals, Russia. Scale: See Image. © Rruff Database
Rhodesite: KHCa2Si8O19·5(H2O) Magadiite: NaSi7O13(OH)3·4(H2O)
Comments: Earth pale tan massive magadiite with dark yellow crystalline rhodesite. Location: East Fork, Trinity River, Trinity County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rhodesite: KHCa2Si8O19·5(H2O)
Comments: Pearly white to tan rhodesite crusts. Location: Quarter-mile east of Trinity River, Trinity County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rhodizite: (K,Cs)Al4Be4(B,Be)12O28
Comments: Two large, blocky, greenish crystals of rhodizite on matrix. Location: Antsogombato, Antsirabe, Madagascar. Scale: 2.6 x 2.5 cm. © Fabre Minerals
Comments: Several yellow, gemmy crystals of rhodizite frozen in a feldspar matrix. Location: Sahanivotry, Sahatany Valley, Madagascar. Scale: 3 x 2.5 x 2 cm. © Isaias Casanova / IC Minerals