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Nikischerite: NaFe++6Al3(SO4)2(OH)18(H2O)12
Comments: Yellowish green nikischerite on matrix. Location: Huanuni Mine, Dalence Province, Bolivia. Scale: Crystal size 5 mm. © Tom Loomis / Dakota Matrix
Nordstromite: Pb3CuBi7(S10Se4) Weibullite: Pb6Bi8(S,Se)18
Comments: Fibrous, silvery crystals of nordstromite. Lacking a chemical analysis it is possible that the crystal is weibullite instead. Location: Falu mine, Falun, Sweden. Scale: Crystal Size 1 mm. © Tom Loomis / Dakota Matrix
Nullaginite: Ni2(CO3)(OH)2
Comments: Green encrustations of nullaginite on matrix. Location: Widgiemooltha, Western Australia, Australia. Scale: Sample size: 2 x 2 x 1 cm. © Tom Loomis / Dakota Matrix
Paakkonenite: Sb2AsS2 Kermesite: Sb2S2O
Comments: Much of the matrix is the gray metallic paakkonenite with red crystals of kermesite and minute yellow crystals of valentinite. Location: Cai' ao mine, Danfong Co., Shaanxi Prov., China. Scale: 3x2x2cm. © Tom Loomis / Dakota Matrix
Parafransoletite: Ca3Be2(PO4)2(PO3,OH)2·4(H2O) Roscherite: Ca(Mn++,Fe++)5Be4(PO4)6(OH)4·6(H2O)
Comments: White, crystalline aggregate sprays of parafransoletite on dark reddish brown roscherite with massive, white, sucrosic whitlockite. Location: Tip Top mine, Custer County, South Dakota, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Paraotwayite: Ni(OH)2-x(SO4,CO3)0.5x x=.5
Comments: Pale green, fibrous, silky, free standing paraotwayite crystals to about 0.25mm. Location: Vaca Murta meteorite, Taltal, Atacama, Chile. Scale: Crystal size .25 mm. © Tom Loomis / Dakota Matrix
Parascholzite: CaZn2(PO4)2·2(H2O) Ehrleite: Ca2ZnBe(PO4)2(PO3,OH)·4(H2O)
Comments: White to clear, slender, 1-2mm, prismatic crystals of ehrleite associated with massive parascholzite. Type specimen courtesy of Museum of Geology, SD School of Mines. Location: Tip Top mine, Custer County, South Dakota, USA. Scale: Crystal size 1-2 mm. © Tom Loomis / Dakota Matrix
Partzite: Cu2Sb2(O,OH)7 (?)
Comments: Light to dark green partzite encrustations with sky-blue chrysocolla and limonite gossan matrix. Location: Comanche mine, Blind Spring Hill, Benton, Mono Co., California, USA. Scale: 5.5 x 3.5 x 4cm. © Tom Loomis / Dakota Matrix
Pascoite: Ca3V10O28·17(H2O)
Comments: Bright orange sugary crusts of pascoite across sandstone matrix. Location: Black Stone Incline, Thompson dist., Grand Co., Utah, USA. Scale: Picture size 2 cm. © Tom Loomis / Dakota Matrix
Pearceite: [Ag9CuS4] [(Ag,Cu)6(As,Sb)2S7]
Comments: Crystals of metallic pearceite to 0.75 mm scattered in vug. Location: Sarbaiskoe, Kazakhstan. Scale: 4x3x3 cm. © Tom Loomis / Dakota Matrix
Penfieldite: Pb2Cl3(OH)
Comments: White to clear or light blue, doubly terminated, striated penfieldite crystals from 0.5 to 2mm associated with boleite as micro coatings. Location: Margarita mine, Sierra Gorda, Chile. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
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
Perraultite: (Na,Ca)2(Ba,K)2(Mn++,Fe++)8(Ti,Nb)4Si8O32(OH,F,O)6
Comments: Dark red prismatic crystal of perraultite to 1mm in matrix. Location: Mariupol massif, Azov Sea Region, Ukraine. Scale: Picture size 3 mm. © Tom Loomis / Dakota Matrix
Petersite-(Y): (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6·3(H2O)
Comments: Fine, light green, acicular crystals of petersite-(Y) to less than 0.2mm occupying an area of about 1mm on dark green malachite. Location: Laurel Hill, Hudson Co., New Jersey, USA. Scale: Picture size .5 cm. © Tom Loomis / Dakota Matrix
Phoenicochroite: Pb2(CrO4)O Hemihedrite: Pb10Zn(CrO4)6(SiO4)2F2
Comments: Yellow hemihedrite crystals to 1 mm within pockets of dark red phoenicochroite crystalline aggregates on matrix. Location: Pack Rat claim, Maricopa Co., Arizona, USA. Scale: Picture size 1.5 cm. © Tom Loomis / Dakota Matrix
Phosphohedyphane: Ca2Pb3(PO4)3Cl
Comments: Clear, prismatic phosphohedyphane crystal on matrix. Location: Argentena mine, Goodsprings, Clark Co., Nevada, USA. Scale: Crystal size 0.5mm. © Tom Loomis / Dakota Matrix
Phurcalite: Ca2(UO2)3O2(PO4)2·7(H2O)
Comments: Bright canary yellow acicular phurcalite crystals to about 0.25mm. Seems to have overgrown perhaps torbernite and individual groups are to 1mm. Location: El Azul mine, Los Azules district, Copiapo Province, Atacama, Chile. Scale: Picture Size 5 mm. © Tom Loomis / Dakota Matrix
Picropharmacolite: Ca4Mg(AsO3OH)2(AsO4)2·11(H2O)
Comments: Snow white acicular, radial spray of picropharmacolite with pink sainfeldite. Location: Wilhelm Mine, Richelsdorf District, Hesse, Germany. Scale: Cluster size 6 mm. © Tom Loomis / Dakota Matrix
Pierrotite: Tl2Sb6As4S16
Comments: Orange-red micro crystals of pierrotite to 0.2 mm.. Location: Jas Roux, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France. Scale: Sample Size 1x2 cm. © Tom Loomis / Dakota Matrix
Pinalite: Pb3(WO4)OCl2
Comments: Yellow needles of pinalite from 0.2 to 0.5mm in rose quartz and blue caledonite. Location: Tiger, Pinal County, Arizona, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix