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Penkvilksite: Na4(Ti++++,Zr)2[Si8O22]·4(H2O)
Comments: Massive white cluster of Penkvilksite. Location: Lovozero, Kola Peninsula, Russia. Scale: .5 x 2.5 cm. © John Veevaert
Pennantite: Mn5Al(Si3Al)O10(OH)8
Comments: Dark brown micaceous pennantite. Location: Gambatesa Mine, Val Graveglia, Genova, Liguria, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Penobsquisite: Ca2Fe++[B9O13(OH)6]Cl·4(H2O)
Comments: Clear crystal of penobsquisite. Location: Inder B deposit and salt dome, Atyrau Oblysy, Kazakhstan. Scale: Crystal Size 7x6x4 mm. © Sergey Vasiliev / Systematic Mineralogy
Penroseite: (Ni,Co,Cu)Se2
Comments: Silvery metallic penroseite masses in matrix. Location: Unnamed prospect in Pacajake Canyon, near Culquechaca, Potosi, Bolivia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Penroseite: (Ni,Co,Cu)Se2 Kitkaite: NiTeSe Sederholmite: NiSe
Comments: B&W polished section image showing kitkaite replacing calcite in penroseite, clausthalite and sederholmite. Note the absence of the clausthalite envelope around kitkaite.. Location: Valley of the Kitka river in Kuusamo, northeast Finland. (AmMin, v50:581). Scale: 100 X. © American Mineralogist
Pentagonite: Ca(VO)Si4O10·4(H2O)
Comments: Blue, crystalline aggregate of pentagonite on zeolite. Location: Wagholi quarries, Poona, India. Scale: Grain size 1.2 cm. © Tom Loomis / Dakota Matrix
Pentahydrite: MgSO4·5(H2O)
Comments: White, powdery pentahydrite. Location: Shaft 371, Schlema-Hartenstein area, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Pentahydroborite: CaB2O(OH)6·2(H2O)
Comments: Transparent, tabular crystal of pentahydroborite on massive material. Location: Fuka Mine, Bicchu Town, Kawakama Co., Okayama Pref., Japan. Scale: Crystal size 0.8 cm. © John Veevaert
Pentlandite: (Fe,Ni)9S8
Comments: Ore sample of a mixture of several sulfide minerals: pentlandite, chalcopyrite, and pyrrhotite. Location: Frood-Stobie Mine, Sudbury District, Ontario, Canada. Scale: 20x15x7 mm. © John Betts - Fine Minerals
Pentlandite: (Fe,Ni)9S8 Plumbopalladinite: Pd3Pb2 Valleriite: 4(Fe,Cu)S·3(Mg,Al)(OH)2 Cubanite: CuFe2S3
Comments: Polished Section image (PPL) of plumbopalladinite (Pl) with polarite Po), surrounded by a rim of isoferroplatinum (Iso) with cubanite (Cu), pentlandite (Pe), and valleriite (Va). Location: Majak Mine, Talnakh, Norilsk, Ural, Russia. Scale: Picture Size 0.7 mm. © Thomas Witzke
Peprossiite-(Ce): (Ce,La)(Al3O)2/3B4O10
Comments: Yellow grains of peprossiite-(Ce) on matrix. Location: Sacrofano Caldera, Campagnano, Lazio, Italy. Scale: Specimen Size 11x4x4 mm. © Sergey Vasiliev / Systematic Mineralogy
Peretaite: CaSb+++4O4(OH)2(SO4)2·2(H2O)
Comments: Clear, tabular, bladed, stellate spray of transparent peretaite crystals. Location: Pereta mine, Scansano, Tuscany, Italy. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Perhamite: Ca3Al7(SiO4)3(PO4)4(OH)3·16.5(H2O)
Comments: Squat, columnar perhamite crystals on matrix. Location: Emmons quarry, Greenwood, Oxford County, Maine, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Periclase: MgO
Comments: Green nickel-rich periclase on matrix. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Periclase: MgO Srebrodolskite: Ca2Fe+++2O5
Comments: Black grains of srebrodolskite with white periclase. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Perite: PbBiO2Cl
Comments: Pale yellow scaly crystalline perite on quartz. Location: Benson, Cochise County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Perlialite: K8Tl4Al12Si24O72·20(H2O)
Comments: Opaque white fibrous perlialite coating on syenite rock. Location: Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Perloffite: Ba(Mn,Fe++)2Fe+++2(PO4)3(OH)3
Comments: Black, prismatic perloffite crystals on matrix. Location: Big Chief mine, Keystone, Pennington County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Perovskite: CaTiO3 Clinochlore: (Mg,Fe++)5Al(Si3Al)O10(OH)8
Comments: Square, opaque perovskite on green clinochlore. Very brilliant and with large crystals (2 x 1.5 cm.). Location: Ilmen Mountains. Chelyabinsk, Urals, Russia. Scale: 6 x 4.5 cm. © Fabre Minerals
Perovskite: CaTiO3 Sodalite: Na8Al6Si6O24Cl2
Comments: Clear crystals of sodalite with hoppered perovskite on matrix. Location: Udersdorf, Rhineland-Palatinate, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals