Wooden crystal models

P. Groth & F. Krantz collection (1880)
Wooden crystal models (ca. 3.5 to 5.5 cm) from the P. Groth & F. Krantz collection (1880)
6 silver- and/or gold-containing minerals. From left to right:
top row: stephanite (392), krennerite (394), hessite (47)
bottom row: sylvanite (533), proustite (215) and freieslebenite (539).
for more info on this collection see Krantz catalog 5, 2nd ed

private collection