Ferberite-Hubernite with Quartz, Chalcopyrite

specimen number:
2312043

location:
Baia Sprie, Maramures Co., Romania

description:
Extremely good for the species from this area, lustrous bladed crystals of the hubnerite and ferberite series to 2.5 cm in height on crystallized quartz with chalcopyrite. This is in very good condition.

The town of Baia Sprie, located in Maramures County, Romania, is situated within the volcanic chain of the Gutai Mountains in the Carpathian region. The local geology is characterized by Neogene calc-alkaline volcanic formations that host complex hydrothermal polymetallic veins rich in gold, silver, copper, lead, and zinc. Mining activity in the area dates back to the medieval period, with written records of extraction starting in 1329 when the settlement was granted privileges as a royal mining center. For centuries, operations on Mine Hill and surrounding subterranean networks made it one of the most productive metal extraction hubs in the region. The mines also became widely recognized for diverse hydrothermal mineral specimens, including various sulfides and sulfosalts, before industrial operations concluded in the early twenty-first century.

The hubnerite-ferberite series represents a continuous solid-solution group of tungsten minerals defined by the end-members hubnerite, which is manganese tungstate, and ferberite, which is iron tungstate. Geologically, these minerals typically form in high-temperature hydrothermal vein deposits and greisens associated with granitic or pegmatitic intrusions, frequently occurring alongside quartz, fluorite, and various sulfide minerals.

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