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weloveminerals
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Such a large and thick, clear probertite is very rare even it is not end-terminated. It is from a one of a kind find in Kohnstein Quarry. It was a worldwide significant find for borates.
Size: 5.2 x 1.6 x 0.8 cm
Locality: Kohnstein quarry, Niedersachswerfen, Thuringia, Germany
