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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
Pringleite: Ca9B26O34(OH)24Cl4·13(H2O)
Comments: SEM back-scatter photomicrograph of a polished thick section containing pringleite (Pr), hilgardite-lA (Hi) and halite (Hal). (CanMin, v31:795). Location: Potash Company of America mine at Penobsquis, near Sussex, New Brunswick, Canada. Scale: Picture Size 2 mm. © Canadian Mineralogist
Prismatine: ([ ],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22
Comments: Prismatic crystals of prismatine in matrix. Location: Waldheim, Saxony, Germany. Scale: Picture size 7 mm. © Thomas Witzke / Abraxas-Verlag
Probertite: NaCaB5O7(OH)4·3(H2O)
Comments: Large colorless prismatic crystal of probertite. Location: Niedersachswerfen, Nordhausen, Erfurt district, Harz Mts, Thuringia, Germany. Scale: Crystal length 4.7 cm. © Thomas Witzke / Abraxas-Verlag
Proshchenkoite-(Y): (Y,REE,Ca,Na,Mn)15Fe++Ca(P,Si)Si6B3(O,F)48
Comments: Brown grains of proshchenkoite-(Y) on filter paper used for XRD analysis. Location: Tommot, Yakutia, Russia. Scale: Grain Size 0.3 mm. © Thomas Witzke
Prosopite: CaAL2(F,OH)8
Comments: Pale violet prosopite microcrystals. Location: Ivigtut, Greenland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Prosperite: CaZn2(AsO4)2·(H2O)
Comments: B&W image of prosperite prisms. Location: Tsumeb, South West Africa (Namibia). Scale: Crystal Length 5 mm. © Canadian Mineralogist
Protasite: Ba(UO2)3O3(OH)2·3(H2O)
Comments: Orange crystals of protasite on matrix. Location: Shinkolobwe mine (Kasolo mine), Shaba (Katanga), Congo (Zaïre). Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Protoanthophyllite: (Mg,Fe)7Si8O22(OH)2
Comments: Drill core showing white acicular crystalline aggregates of protoanthophyllite in matrix with a close up image on the right.. Location: Drill-core sample from the waste dump of the abandoned Takase chromite mine, Okayama Prefecture, Japan. Scale: Core size 3 cm. © American Mineralogist
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
Protomangano-ferro-anthophyllite: (Mn++,Fe++)2(Fe++,Mg)5(Si4O11)2(OH)2
Comments: Light brown, silky protomangano-ferro-anthophyllite crystals on brown fayalite with grunerite. Location: Suishouyama Pegmatite, Lizaka, Kawamatacho, Fukushima, Japan. Scale: Specimen Size 3x3 cm. © Diederik Visser
Proudite: Cu1.9Ag0.1Pb15.6Bi20.4Sb0.1S32.4Se14.5
Comments: BSE image of proudite aggregates from Tennant Creek, Australia. Pr = proudite, light grey: J = junoite, G = gangue and holes. (CanMin v47:25). Location: Juno mine, Tennant Creek, Northern Territory, Australia. Scale: See Image. © Canadian Mineralogist
Proustite: Ag3AsS3
Comments: Crystal group of gemmy, red proustite. Smithsonian collection. Location: Dolores I Mine, Chañarcillo, Atacáma Province, Chile. Scale: Specimen Size 6x8 cm. © Dave Barthelmy
Pseudoboleite: Pb5Cu4Cl10(OH)8·2(H2O)
Comments: Blue crystal of pseudoboleite. Location: Curuglu Mine, Santa Rosalía (El Boleó), Boleó District, Mun. de Mulegé, Baja California Sur, Mexico. Scale: Crystal size 4.5 mm. © Thomas Witzke / Abraxas-Verlag
Pseudobrookite: (Fe+++,Fe++)2(Ti,Fe++)O5
Comments: Black, prismatic crystals of pseudobrookite on matrix. Location: Sierra County, New Mexico, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Pseudocotunnite: K2PbCl4 (?)
Comments: Bright white botryoidal pseudocotunnite coatings. Location: Vesuvius, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species