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Black siderite in the variety sphaerosiderite on basalt rock from the Steinheim quarry, Hanau, Hesse. 5,5 cm in width. (Author: Andreas Gerstenberg)

Black siderite in the variety sphaerosiderite on basalt rock from the Steinheim quarry, Hanau, Hesse. 5,5 cm in width. (Author: Andreas Gerstenberg)

Dimensions: 600 x 450
File size: 36.93 kbytes
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