Description

Excellent specimen showing good crystals of automorphous bournonite (a sulfoantimonide of lead and copper) associated with large petals of brown siderite.

Very fine size and quality for the Pierre Rousse deposit (former iron mine) in Vizille, Isère department.
A set of minerals from the collection of Eric Asselborn, and previously from the collection of Philippe Glastre, who discovered it in the 1980s. The latter was once president of the Grenoble-based Club Dauphinois de Minéralogie et Paléontologie (CDMP).

Here is a video of these crystals of bournonite and siderite from Vizille:

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