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Typically shaped struvite crystal from the type locality Hamburg. These crystals were found when ancient manure pits having been discovered during the construction of the St. Nikolay church. (Author: Andreas Gerstenberg)

Typically shaped struvite crystal from the type locality Hamburg. These crystals were found when ancient manure pits having been discovered during the construction of the St. Nikolay church. (Author: Andreas Gerstenberg)

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