Description
This is specimen abundantly covered with the rare Manganese-Aluminum-Magnesium-Arsenic silicate Ardennite-(As). Sprays with long-prismatic, honey-yellow crystals up to 1.2 cm are perched on massive milky Quartz. The clusters have a glassy, not quite adamantine luster. A piece from the type locality north of the town of Salmchâteau on the River Salm.