4
Tetrahedrite
Two very lustrous, black tetrahedrons imbricated in the form of a cross (though not at a perfect right angle) with a tuft of dark red, polysynthetic sphalerite (4.6 cm) close to the summit of the larger one, some flat crystals of bournonite (1 cm max) and small siderite lenses at the back (0.9 cm max).
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