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Rabbittite: Ca3Mg3(UO2)2(CO3)6(OH)4·18(H2O)
Comments: Fine, yellow, acicular sprays of rabbittite to about 1mm on matrix. Location: Hideout mine, San Juan Co., Utah, USA. Scale: 20x10x4mm. © Tom Loomis / Dakota Matrix
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
Reddingite: Mn++3(PO4)2·3(H2O)
Comments: Golden brown to brown, highly lustrous, pseudo-octahedral crystals of reddinite. Location: Cigana mine, Galileia, Minas Gerais, Brazil. Scale: Crystal size 0.5 mm. © Tom Loomis / Dakota Matrix
Reppiaite: Mn++5[(V,As)O4]2(OH)4
Comments: Vitreous orange crystals of reppiaite embedded in matrix. Location: Gambatesa mine, Genova, Ligurai, Italy. Scale: Crystal size 0.5mm. © Tom Loomis / Dakota Matrix
Rhodonite: (Mn++,Fe++,Mg,Ca)SiO3
Comments: Deep red blocky prismatic crystals of rhodonite to 3cm. Location: Broken Hill mine, New South Wales, Australia. Scale: 6.5 x 5 x 4cm. © Tom Loomis / Dakota Matrix
Ruizite: CaMn+++Si2O6(OH)·2(H2O)
Comments: Deep reddish brown crystals of ruizite as radial, acicular sprays to 0.1mm. Location: Christmas mine, Gila Co., Arizona, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Sahlinite: Pb14(AsO4)2O9Cl4
Comments: Light lemon yellow sahlinite on dark hausmannite and white dolomite matrix. Location: Langban mine, Filipstad, Värmland , Sweden. Scale: Crystal size 1.5cm. © Tom Loomis / Dakota Matrix
Sanromanite: Na2CaPb3(CO3)5 Juangodoyite: Na2Cu(CO3)2 Chalconatronite: Na2Cu(CO3)2·3(H2O)
Comments: Yellowish, long balded sanromanite crystals in vug with platy, blue juangodoyite replacing green chalconatronite. Location: Santa Rosa mine, Iquique Province, Tarapaca, Chile. Scale: Picture size 3 mm. © Tom Loomis / Dakota Matrix
Santarosaite: CuB2O4
Comments: Druzy rosettes of blue santarosaite on matrix. Location: Santa Rosa mine, Iquique Province, Chile. Scale: Rosette Size 0.3 mm. © Tom Loomis / Dakota Matrix
Scandiobabingtonite: Ca2(Fe++,Mn)ScSi5O14(OH)
Comments: Green micro crystals of scandiobabingtonite to about 0.75mm with several grayish brown ball-like micro crystals of titanite to 0.75mm scattered in a large vug. Location: Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway. Scale: Picture size 2.5 mm. © Tom Loomis / Dakota Matrix