PROUSTITE

ABOUT THE SPECIMEN

Quality proustite is highly coveted by collectors everywhere, owing to its visually striking appearance and its nature as a silver-bearing mineral. This cabinet-size specimen comes from the famed Imiter Mine, and it's by far one of the richest specimens I've seen from Morocco. Featuring a large display face with essentially uninterrupted coverage, the crystals are bunched into rounded groupings that make the arrangement very three-dimensional. On the edges are larger crystals that measure to 6mm, some of them showing blood red flashes when in light. These newer finds helped make the species more accessible to collectors for a lower cost as compared to their classic counterparts in Chile and central Europe (were this specimen to have come from either, its value would be astronomical). From the collection of Bob Werner, who purchased it from Horst Burkard in 2006.

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The Imiter Mine represents a world-class Neoproterozoic epithermal Ag-Hg vein deposit formed around 550 Ma during late Ediacaran extensional tectonics and rhyolitic volcanism. The deposit occurs along the transcrustal Imiter fault zone cutting Cryogenian black schists, with silver mineralization including proustite, argentite, polybasite, acanthite, and native silver-mercury amalgam. Proustite forms as blood-red to crimson prismatic crystals, typically ranging from sub-millimeter up to 2 cm, often as sprays or rosette clusters on white calcite matrix or associated with native silver. What makes Imiter proustite significant is the mine's status as one of few modern localities producing quality crystallized material of this light-sensitive ruby silver species. The deposit formed through degassing-driven precipitation from mantle-sourced fluids, making it a Precambrian analog to modern epithermal systems. Mining continues actively, though specimen-quality proustite appears sporadically depending on vein zones accessed.