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Pyrargyrite: Ag3SbS3
Comments: Pyrargyrite with quartz. Location: Fresnillo, Zacatecas, Mexico. Scale: 3 x 2.5 cm. © Fabre Minerals
Pyromorphite: Pb5(PO4)3Cl
Comments: Apple green pyromorphite. Location: San Andres Mine, Villaviciosa, Cordoba, Spain. Scale: 6.5 x 5 cm. © Fabre Minerals
Pyrophyllite: Al2Si4O10(OH)2 Rutile: TiO2
Comments: Rutile on fine-grained pyrophyllite. Location: Graves Mt. Georgia, USA. Scale: 4.5 x 5 cm. © Fabre Minerals
Quartz: SiO2 Chalcopyrite: CuFeS2
Comments: Well-formed crystals of chalcopyrite and quartz. Location: Boldut mine, 61 level (350 meters deep), Cavnic, Maramures, Rumania. Scale: 5.5 x 3.5 cm. © Fabre Minerals
Quartz: SiO2 Ilvaite: CaFe++2Fe+++Si2O7O(OH)
Comments: Black, prismatic ilvaite with quartz. Location: First Sovietskij mine, Dalnjegorsk, Russia. Scale: 3.5 x 4.5 cm. © Fabre Minerals
Rhodizite: (K,Cs)Al4Be4(B,Be)12O28
Comments: Two large, blocky, greenish crystals of rhodizite on matrix. Location: Antsogombato, Antsirabe, Madagascar. Scale: 2.6 x 2.5 cm. © Fabre Minerals
Rhodochrosite: MnCO3
Comments: Cherry red rhodochrosite with quartz, tetrahedrite, chalcopyrite and fluorite matrix. Location: Rivas Pocket, Fluorite Raise, Sweet Home mine, Alma, Colorado, USA. Scale: 8 x 8cm.. © Fabre Minerals
Rhodonite: (Mn++,Fe++,Mg,Ca)SiO3
Comments: Light red rhodonite and minor quartz. Location: Chiurucu mine, Dos de Mayo, Peru. Scale: 3 x 3.5 cm. © Fabre Minerals
Roselite-beta: Ca2(Co,Mg)(AsO4)2·2(H2O)
Comments: Deep red, well crystallized roselite-beta covering a small pocket in white calcite. Location: Ahrbar, Bou-Azzer area. Scale: 7 x 4 x 4.5 cm. © Fabre Minerals
Rutile: TiO2 Pyrophyllite: Al2Si4O10(OH)2
Rutile: TiO2 Hematite: Fe2O3
Comments: Acicular, golden yellow crystals of rutile epitaxially overgrown on black crystals of hematite. The overgrowths are perpendicular to the trigonal crystallography of the hematite. Location: Novo Horizonte, Bahia Brazil. Scale: 4 x 3.5 x 3 cm. © Fabre Minerals
Sabinaite: (Na,Ca)4Zr2Ti(CO3)4O4
Comments: White, prismatic crystals of sabinaite on matrix. Location: Poudrette quarry, Mont St Hilaire, Rouville county, Quebec. Scale: 4.5 x 3.8 x 3 cm. © Fabre Minerals
Scapolite: (Na,Ca)4[(Al,Si)12O24]Cl
Comments: Violet colored, gemmy crystal of Scapolite, with upper terminations. Location: Dodoma, Tanzania. Scale: 1 x 0.5 cm. © Fabre Minerals
Scheelite: CaWO4
Comments: Orange scheelite with white mica. Location: Pingwu, Sichuan, China. Scale: 9.5 x 9 cm. © Fabre Minerals
Schorl: NaFe++3Al6(BO3)3Si6O18(OH)4
Comments: Parallel grouping of sharp, black schorl crystals showing terminations. Location: Davib Ost, Erongo Mountains Namibia. Scale: Crystal size: 1.7 x 1.4 cm. © Fabre Minerals
Semseyite: Pb9Sb8S21
Comments: Tabular crystals forming groups and rosettes of gray semseyite with creamy greenish yellow siderite. Location: Herja mine, Maramures Rumania. Scale: 6.5 x 6 x 3.5 cm. © Fabre Minerals
Serandite: Na(Mn++,Ca)2Si3O8(OH) Analcime: NaAlSi2O6·(H2O) Natrolite: Na2[Al2Si3O10]·2(H2O)
Comments: Orange-red, blocky serandite with white, blocky natrolite and white, equant grains of analcime. Location: Mt. St. Hilaire, Canada. Scale: 4 x 3 cm. © Fabre Minerals
Siderite: Fe++CO3 Arsenopyrite: FeAsS
Comments: White, metallic arsenopyrite and tan siderite crystals. Location: Panasqueira (2000, 3rd level), in the region of Beira Baixa, Portugal. Scale: 11 x 7 cm. © Fabre Minerals
Siderite: Fe++CO3
Comments: Blocky siderite crystals on quartz. Location: Panasqueira (2nd level), in the region of Beira Baixa, Portugal. Scale: 7 x 8 cm. © Fabre Minerals
Comments: Bladed siderite crystal groups on crystallized quartz matrix. Location: Peyrebrune, Tarn, France. Scale: 8.7 x 6.5 x 4.7 cm. © Fabre Minerals