Arseniosiderite
Manganese deposit, Romanèche-Thorins, La Chapelle-de-Guinchay, Mâcon, Saône-et-Loire, Bourgogne-Franche-Comté, France
8.7 x 6.4 x 3.5 cm. Arseniosiderite is an uncommon hydrated arsenate and this fine old-time specimen is from the Type Locality in France. The arseniosiderite is present as light tan fibrous radial aggregates. The sharp, lustrous, translucent, burnt-orange rhombs, to 2 mm, are likely to be either calcite or fluorite, and are dramatically and ...
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