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Potassicleakeite: KNa2Mg2Fe+++2LiSi8O22(OH)2 Watatsumiite: Na2KMn2LiV2Si8O24
Comments: Yellow green prismatic crystal of watatsumiite terminated by pyramidal faces associated with reddish brown potassicleakeite and clear quartz (JMPS, v 98, p 149). Location: Tanohata mine, Iwate Prefecture, Japan. Scale: See Image. © JMPS
Potassicpargasite: (K,Na)Ca2(Mg,Fe++)5Si8O22(OH,F)2
Comments: Brownish-black potassicpargasite crystal in calcite (repaired). Location: Simonby, Pargas, Turku ja Pori, Finland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Potassicrichterite: (K,Na)(CaNa)2Mg5[Si8O22](OH,F)2
Comments: Lapidary sample of 'Dianite' consisting of blue nepherite with fiberous strontian (~3.5 % SrO) potassicrichterite. White nodule is quartz-microcline surrounded by dark green potassic-magnesio-arfvedsonite. Location: Kedrovyi alkaline Massif, Murunskii Massif, Chara and Tokko Rivers Confluence, Aldan Shield, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia. Scale: Specimen Size 8.5x4x1 cm. © Pavel M. Kartashov
Potassicsadanagaite: (K,Na)Ca2[Fe++3(Al,Fe+++)2][Si5Al3O22](OH)2
Comments: Dark greenish black crystalline potassicsadanagaite fragments. Location: Ilmeny Mountains, Chelyabinsk District, Southern Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Potosiite: Pb6Sn2FeSb2S14 Franckeite: (Pb,Sn)6Fe++Sn2Sb2S14
Comments: Visually indistinguishable metallic potosiite/franckeite crystals to 6 mm.. Location: San Jose mine, Oruro City, Oruro Department, Bolivia. Scale: Crystal size 6 mm. © Rob Lavinsky
Pottsite: PbBiH(VO4)2·2(H2O)
Comments: Sub-mm, bright yellow to orange pottsite crystals form coating on one side of specimen. Location: Linka Mine, Potts, Lander County, Nevada, USA. Scale: 3.5 x 4 cm. © John Veevaert
Poubaite: PbBi2Se2(Te,S)2
Comments: Gray granular crystalline poubaite in white calcite. Location: Oldrichov, near Tachov, western Bohemia, Zapadocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Poughite: Fe+++2(TeO3)2(SO4)·3(H2O)
Comments: Yellow coatings of poughite on matrix. Location: Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Povondraite: (Na,K)(Fe+++,Fe++)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4
Comments: Deep greenish black povondraite crystals. Location: Malacacheta, Minas Gerais, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Powellite: CaMoO4
Comments: Sharp, thumbnail-sized crystal group of yellowish brown lustrous powellite crystals, the largest measuring 15 x 18 mm in size. Location: Pandulane quarry, Nasik district, Maharashtra, India. Scale: 20 x 25 x 16 mm. © Dan Weinrich
Poyarkovite: Hg3ClO
Comments: Dark greenish black thin poyarkovite film on white chert. Location: Elena, Durango, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Prehnite: Ca2Al2Si3O10(OH)2
Comments: Very lustrous and brilliant prehnite. Location: Deep Sahara, Morocco: Djbel Melh, Bou-Arfa. Scale: 9 x 6.5 cm. © Fabre Minerals
Preisingerite: Bi3(AsO4)2O(OH)
Comments: Olive-greenish crystals of preisingerite on quartz. Location: Pucher Shaft, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Preiswerkite: NaMg2Al3Si2O10(OH)2
Comments: Pale green fine grained preiswerkite masses in dark amphibolite rock. Location: Geisspfad, Binnental, Valias, Switzerland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Preobrazhenskite: Mg3B11O15(OH)9
Comments: Crudely formed white to tan translucent preobrazhenskite crystal on yellow crystalline massive material. Location: Lake Inder, Atyrau, Kazakhstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Pretulite: ScPO4
Comments: SEM-BSE image of a euhedral crystal of pretulite (left), and proposed crystal forms (right). Location: Apatite-rich oolitic Ordovician ironstone at Saint-Aubin-des-Châteaux, Armorican Massif, France. Scale: See Picture. © Canadian Mineralogist
Priceite: Ca2B5O7(OH)5·H2O Ginorite: Ca2B14O23·8(H2O)
Comments: Clear platy crystalline coatings of ginorite on rock with white priceite. Location: Corkscrew Canyon, Death Valley, Inyo County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Priceite: Ca2B5O7(OH)5·H2O
Comments: Botryoidal priceite aggregate. Location: Lone Randi Quarry, Curry County, Oregon, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Priderite: (K,Ba)(Ti,Fe+++)8O16
Comments: Clusters of sub-mm black, opaque crystals of priderite. Location: Eveslogchorr Mt., Khibiny, Kola, Russia. Scale: 2.5 x 3.4 cm. © John Veevaert