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Piemontite-(Sr): (Ca,Mn++)(Sr,Ca)Mn+++(Al,Mn+++,Fe+++)2(SiO4)(Si2O7)O(OH)
Comments: Carmine red crystals of piemontite-(Sr) found on quartz. Location: Graveglia, Piemont, Italy. Scale: See Image. © Rruff Database
Plumbonacrite: Pb10(CO3)6O(OH)6
Comments: Transparent crystals of plumbonacrite. Location: Wanlockhead, Scotland. Scale: See Image. © Rruff Database
Poudretteite: KNa2B3Si12O30
Comments: Pale pink gem fragment of poudretteite. Location: Pyant-gyi mine, near Pein-pyit, Mogok, Sagaing Region, Mandalay Division, Burma. Scale: See Image. © Rruff Database
Protoferro-anthophyllite: (Fe++,Mn++)2(Fe++,Mg)5(Si4O11)2(OH)2
Comments: Sprays of brown-green prismatic protoferro-anthophyllite crystals. Location: Nyppio mine, near Utsonomiya, Japan. Scale: See Image. © Rruff Database
Pumpellyite-(Al): Ca2(Al,Fe++,Mg)Al2(SiO4)(Si2O7)(OH,O)2·H2O
Comments: Pale green radiating fibrous to bladed pumpellyite-(Al) crystals on matrix. Location: La Fleche Quarry, Bertrix, Luxembourg Province, Belgium. Scale: See Image. © Rruff Database
Pyrophanite: MnTiO3
Comments: Red-brown platy pyrophanite crystals with deep red internal hints, associated with barite. Location: Harstigen Mine, Pajsberg, Filipstad, Värmland, Sweden. Scale: See Image. © Rruff Database
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
Richetite: PbU++++++4O13·4(H2O)
Comments: Brown plates of richetite. Location: Shinkolobwe mine, Katanga, Congo. Scale: See Image. © Rruff Database
Roubaultite: Cu2(UO2)3(CO3)2O2(OH)2·4(H2O)
Comments: Lime green, granular roubaultite associated with pale yellow acicular uranophane. Location: KOV mine, Kamoto, Shaba, Democratic Republic of Congo. Scale: See Image. © Rruff Database
Roxbyite: Cu1.78S
Comments: Bronzy, metallic, massive roxbyite associated with hematite, co-type sample. Location: Olympic Dam mine, Roxby Downs, South Australia, Australia. Scale: See Image. © Rruff Database