Quartz specimen with marked "window" growths with inclusions. These Allos pass crystals are not very common on the market. Allos pass is situated on the edge of Mercantour National Park approximately 20 km from the small village of Barcelonnette.

Excellent and rich group of prismatic zinkenite crystals, some of them with a good size, with striated faces, with a huge size chalcocite crystal with planar to curved terminal faces. Good metallic luster and well disposed on a vug with lenticular siderite crystals. Usually they occurs covered by calcite. A hig quality specimen from this species and locality.