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Pokrovskite: Mg2(CO3)(OH)2·0.5(H2O) Hydromagnesite: Mg5(CO3)4(OH)2·4(H2O)
Comments: Tan spherical pokrovskite on serpentinite rock with white hydromagnesite sprays. Location: KCA Quarry, San Benito County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Polarite: Pd(Bi,Pb) Pasavaite: Pd3Pb2Te2
Comments: BSE image of pasavaite (pas) embedded in polarite (po) in association with sperrylite (sp), Pd-Pb-Bi-Te and Au-Ag phases. (CanMin, v47:53). Location: Talnakh deposit, Noril’sk-Talnakh Ni-Cu camp, Taimyr Autonomous District, Russia. Scale: See Image. © Canadian Mineralogist
Poldervaartite: (Ca,Mn++)2SiO3(OH)2
Comments: Moderate reddish tint to yellowish poldervaartite crystalline druze on matrix. Location: N'chwaning II mine, section 5 south, stope 46-47 roof, Kuruman, Kalahari desert, South Africa. Scale: 6 x 3.5 x 4 cm. © Fabre Minerals
Poldervaartite: (Ca,Mn++)2SiO3(OH)2 Bultfonteinite: Ca2SiO2(OH,F)4
Comments: Bow-tie clusters of white, acicular bultfonteinite and blocky, beige-colored poldervaartite on matrix. Location: N'Chwaning mine, South Africa. Scale: picture size 4 cm. © John Veevaert
Polhemusite: (Zn,Hg)S
Comments: B&W polished section (PPL) image (green filter) of aggregates of polhemusite (P) in stibnite (S) with associated cinnabar (C) and quartz (Q). (AmMin, v63:1153). Location: Mercury-bearing antimony ore from the B and B deposit, Big Creek district, Valley County, Idaho. Scale: Scale Bar 0.5 mm. © American Mineralogist
Polkanovite: Rh12As7
Comments: BSE image of isoferroplatinum (IFP) and polkanovite (PLK) inclusions in native osmium (Os, IR, Ru). Location: Heavy minera concentrates, Miass River, Ural, Russia. Scale: See Image. © Diederik Visser
Pollucite: (Cs,Na)2Al2Si4O12·(H2O)
Comments: Isometric crystal of pollucite with clear quartz and sucrosic albite matrix. Location: Shigar mine, Dossu, Skardu, Pakistan. Scale: 14.6x10x11.5 cm. © Fabre Minerals
Polyakovite-(Ce): (Ce,La,Nd,Pr,Ca)4(Mg,Fe++)(Cr,Fe+++)2(Ti,Nb)2Si4O22
Comments: Black, pitchy, polyakovite-(Ce) crystal showing conchoidal surfaces so typical for this mineral. Green fluororichterite overgrowth is just visible. Measured radioactivity is 146µR/h. Location: Pit No. 97 (N97 Mine), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia. Scale: Specimen size is 4.5x3x2.5 cm. © Pavel M. Kartashov
Polybasite: [Ag9CuS4] [(Ag,Cu)6(Sb,As)2S7]
Comments: Lustrous, metallic steel-gray rosette of polybasite crystals. Location: Guanajuato, Mexico. Scale: 18 x 16 x 8 mm. © Dan Weinrich
Polycrase-(Y): (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6
Comments: Large, black, blocky polycrase-(Y) crystal. Location: Hidra, Vest-Agder, Norway. Scale: Crystal size 0.8 X 2.0 cm. © John Veevaert
Polydymite: NiNi2S4
Comments: Octahedral crystals of polydymite on matrix. Location: Grüneau Mine (Grüne Au Mine; Grünau Mine), Schutzbach, Betzdorf, Siegen District (W), Rhineland-Palatinate, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Polyhalite: K2Ca2Mg(SO4)4·2(H2O)
Comments: White crystals of polyhalite in matrix. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Polylithionite: KLi2AlSi4O10(F,OH)2
Comments: Rosette of polylithionite crystals. Location: Mt. St. Hilaire, Quebec, Canada. Scale: 2.5 x 2.3 cm. © John Veevaert
Polylithionite: KLi2AlSi4O10(F,OH)2 Shibkovite: K(Ca,Mn,Na)2(K2-x,[ ]x)2ZnSi12O30 (x~0.8)
Comments: Clear crystalline shibkovite aggregates with peach colored translucent polylithionite. Location: Dara-Pioz, Tien-Shan, Tadzhikistan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ponomarevite: K4Cu++4OCl10
Comments: Orange ponomarevite. The sample stored in a closed vial. The photo was made through the vial. Location: Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Poppiite: Ca2(V+++,Fe+++,Mg)(V+++,Al)2(Si,Al)3(O,OH)14
Comments: SEM micrograph of a poppiite crystal fragment (AmMin v91. p585). Location: Gambatesa mine, near the village of Reppia (Val Graveglia, Northern Apennines, Italy). Scale: See Image. © American Mineralogist
Portlandite: Ca(OH)2
Comments: Cleaved mass of white portlandite. Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 4 x 1.5 cm. © John Veevaert
Posnjakite: Cu4(SO4)(OH)6·(H2O)
Comments: Waxy blue aggregates of posnjakite. Location: Ecton mine, Audubon, Montgomery County, Pennsylvania, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Potarite: PdHg
Comments: BSE probe image showing a composite grain of potarite (PdHg), and a PtNiFeCu alloy in an intertitial site and filling a fracture in a chromite grain (Chr). Location: Southern Quebec Ophiolite Belt, Thetford Mines ophiolitic complex, Canada. Scale: See Image. © National Resouces of Canada
Comments: Potarite grains in a geletin capsule. Location: Potaro River, Kangaruma District, Guyana. Scale: Sample Size 4.1 x 2.2 x 1.9 cm. © Rob Lavinsky