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4,7 x 2,5 x 2 cm.
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White barite pompom of about 2 cm diameter, in perfect...
Sphalerite fluoresces under UV light 7,5 x 6 x 3,6 cm.
Plate composed of bournonite crystals in cogwheels and...
Bournonite in a notched wheel, naturally patinated with slight...
An unusual piece for the Malines mine: on the front, the...