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Actinolite: Ca2(Mg,Fe++)5Si8O22(OH)2
Comments: Sharp, floater actinolite crystal with a slight green tint. Location: Namibian dessert, more or less due West of Uis, Namibia. Scale: 8.5 x 2.5 x 2 cm. © Fabre Minerals
Adamite: Zn2(AsO4)(OH)
Comments: Sprays of adamite with intense color and well defined crystals which stand out from the matrix. Location: Ojuela mine, Mapimi, Durango, Mexico. Scale: 5 x 5 cm. © Fabre Minerals
Allanite-(La): Ca(REE,Ca)Al2(Fe++,Fe+++)(SiO4)(Si2O7)O(OH)
Comments: A single prismatic allanite-(La) crystal with small, lustrous black magnetite crystals, all on a matrix of hedenbergite. Location: Mina Nueva Vizcaya, Sierra Gorda, Burguillos del Cerro, Badajoz, Spain. Scale: Crystal size 0.9 x 0.5 cm. © Fabre Minerals
Analcime: NaAlSi2O6·(H2O) Serandite: Na(Mn++,Ca)2Si3O8(OH) 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
Anatase: TiO2
Comments: anatase with calcite. Location: Hardangervidda, Norway, (1999). Scale: 1.5 x 3 cm. © Fabre Minerals
Andalusite: Al2SiO5 = Al[6]Al[5]OSiO4
Comments: Wine colored andalusite associated with mica. Location: Sierra Albarrana, Cordoba, Spain. Scale: 4.5 x 3.5 cm. © Fabre Minerals
Andradite: Ca3Fe+++2(SiO4)3 Clinochlore: (Mg,Fe++)5Al(Si3Al)O10(OH)8
Comments: Transparent topazolite, the yellow variety of andradite on clinochlore. Location: Yellow Cat Mine, New Idria District, San Benito County. California, USA. Scale: 2.7 x 2.5 cm. © Fabre Minerals
Andradite: Ca3Fe+++2(SiO4)3
Comments: Andradite (var. Demantoid) Garnet. Location: Namgar mine, Erongo Mts. Namibia. Scale: 3.5 x 3.2 cm. © Fabre Minerals
Apophyllite: KCa4(Si4O10)2F·8(H2O) Apophyllite-(KF): (K,Na)Ca4Si8O20(F,OH)·8(H2O) Stilbite-Ca: NaCa4[Al8Si28O72]·n(H2O) (n=28-32)
Comments: Doubly terminated, very clear and perfect fluorapophyllite with white stilbite. Location: Jalgaon, India. Scale: 4 x 3.5 cm. © Fabre Minerals
Apophyllite-(KF): (K,Na)Ca4Si8O20(F,OH)·8(H2O) Stilbite-Ca: NaCa4[Al8Si28O72]·n(H2O) (n=28-32) Apophyllite: KCa4(Si4O10)2F·8(H2O)
Arsenopyrite: FeAsS Siderite: Fe++CO3
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
Astrophyllite: K2Na(Fe++,Mn)7Ti2Si8O26(OH)4
Comments: Dark brown acicular masses of astrophyllite in calcite matrix. Location: Khibini, Kola Peninsula, Russia. Scale: 11 x 9 cm. © Fabre Minerals
Atacamite: Cu2Cl(OH)3
Comments: Atacamite in a well crystallized pocket. Location: Mina Lily, Pisco Umay, Ica Dept. Peru. Scale: 5 x 4.5 cm. © Fabre Minerals
Augelite: Al2(PO4)(OH)3
Comments: Apple green augelite with semi-transparent, well developed, brilliant crystals. Location: Rapid Creek, Yukon, Canada. Scale: 3.5 x 2 cm. © Fabre Minerals
Axinite-(Fe): Ca2Fe++Al2BO3Si4O12(OH)
Comments: Doubly terminated ferroaxinite crystal with good luster and form. Location: Puyva, Polar Ural, Russia. Scale: 3x5x2 cm. © Fabre Minerals
Azurite: Cu3(CO3)2(OH)2
Comments: Sharp, dark blue, crystalline azurite group. Location: Puit IX, Touissit, Oujda. Scale: 5 x 3.3 x 1.3 cm. © Fabre Minerals
Bariosincosite: Ba(V++++O)2(PO4)2·4(H2O) Fluellite: Al2(PO4)F2(OH)·7(H2O)
Comments: Vivid green crystals of bariosincosite well placed on a matrix covered by colorless, tabular fluellite with some minor metavariscite. Location: Eugui Quarry, Cantera Azkarate, Eugui, Navarra, Spain. Scale: Rosette size: 0.3 x 0.2 cm. © Fabre Minerals
Barite: BaSO4
Comments: Honey-colored very transparent barite crystal group. Location: (1998) Meikle mine, Elko Co. Nevada, USA. Scale: 5 x 6 cm. © Fabre Minerals
Comments: Tabular, clear crystal of barite on a small matrix of pinkish dolomite. Fluorescence under UV light. Location: Cerro Warihuyn, 2850 m, Miraflores, Huamalias, Huanuco Peru. Scale: 3.4 x 2.8 x 0.9 cm. © Fabre Minerals
Barrerite: (Na,K,Ca)2Al2Si7O18·6(H2O)
Comments: Barrerite, an extremely rare zeolite was found in large cavities on a tidal flat. Location: Rocky Pass, Kuiu Island, Alaska. Scale: 5.5 x 6 cm. © Fabre Minerals