Almost certainly one of, if not the largest probertite ever recovered, and on matrix. Probertite has a brutally high cleavage, and the discovery situation in the quarry was precarious.
There were only two people who dared to venture there, and the period in which the mineral-bearing layer was even accessible ended after just two years.
Size: 16.5 x 4.4 x 2.3 cm
Origin: Stbr. am Kohnstein, Niedersachswerfen, Thuringia, Germany
