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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
Siderite: Fe++CO3 Garronite: Na2Ca5Al12Si20O64·27(H2O)
Comments: Translucent white micro crystals of garronite on brown siderite crystals. Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species