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Rasvumite: KFe2S3
Comments: Reddish brown micro crystals of rasvumite in vugs to about 0.75mm. Location: Kirovskiy mine, Khibina massif, Kola Peninsula, Russia. Scale: 3.5 x 2.5 x 2.5cm. © Tom Loomis / Dakota Matrix
Comments: Opaque dull orange fibrous rasvumite masses. Location: Coyote Peak, Humboldt County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rathite: Pb8Pb4-x(Tl2As2)x(Ag2As2)As16S40
Comments: Gray metallic foliated rathite, with pyrite in sugary dolomite. Location: Lengenbach Quarry, Binnental, Valais, Switzerland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Black prismatic crystal of rathite with glossy surface and red realgar on white dolomite. Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal length 5 mm. © Walter Gabriel
Rauenthalite: Ca3(AsO4)2·10(H2O)
Comments: Bright white botryoidal to transparent colorless prismatic rauenthalite microcrystals. Location: Gabe Gottes, Sainte-Marie-aux-Mines, Alsace, Haute-Rhin, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Rauvite: Ca(UO2)2V+++++10O28·16(H2O)
Comments: Irregular grains of dark-colored rauvite in matrix. Location: Monument No. 2 Mine, Monument Valley, Apache County, Arizona, USA. Scale: Picture size 2.5 mm. © Paul M. Schumacher
Comments: Brownish-yellow scaly rauvite on sandstone. Location: Monument Valley, Apache County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ravatite: C14H10
Comments: Small crystals of ravatite. Location: Carola Mine, Freital, near Dresden, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Realgar: AsS Duranusite: As4S
Comments: Small black Duranusite in orange-red realgar matrix. Location: Duranus, Alpes-Maritimes, Provence-Alpes-Côte d'Azur, France. Scale: Picture size 1.3 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
Realgar: AsS
Comments: Sharp, dark red crystals of realgar to 2 cm on calcite. Location: Hunan Province, Chin. Scale: Crystal size 2 cm. © John Attard