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Heidornite, a rare borate from the type locality, an oil drilling near Frenswegen, Nordhorn, Lower Saxony. Shown is a 4 mm crystalline aggregate coming up from 1968 m depth. Some of the rarest stuff you can get from Germany. (Author: Andreas Gerstenberg)

Heidornite, a rare borate from the type locality, an oil drilling near Frenswegen, Nordhorn, Lower Saxony. Shown is a 4 mm crystalline aggregate coming up from 1968 m depth. Some of the rarest stuff you can get from Germany. (Author: Andreas Gerstenberg)

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