Probertite - Kohnstein Quarry, Thuringia

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