Ferberite-Hubnerite with Pyrite, Siderite

specimen number:
2312177

location:
Herja mine, Maramures Co., Romania

description:
Choice miniature for the species and locality, prismatic lustrous terminated crystals to 1.5 cm in height are coming off a siderite crystal matrix with pyrite. In terrific condition.

The Herja Mine, located in Maramures County, Romania, is a historic underground mining site with centuries of activity focused on base and precious metal extraction. Geologically, the deposit is situated within the Neogene volcanic belt of the Eastern Carpathians, where complex hydrothermal veins cutting through sedimentary and volcanic host rocks formed rich epithermal orebodies. The mineralizing solutions deposited significant quantities of lead, zinc, and copper sulfides alongside gangue minerals. The underground stopes and vein systems are internationally renowned among mineral collectors for producing crystallized specimens, most notably large, well-formed groups of stibnite crystals associated with quartz, sphalerite, and marcasite.

The ferberite-hubnerite series represents a group of tungsten-bearing minerals that form a solid solution between iron tungstate and manganese tungstate. These minerals typically occur in hydrothermal vein deposits, commonly associated with granitic rocks and tin or tungsten ore systems. They are usually found as dark, brownish-black to black crystals with a submetallic to resinous luster. Members of this series serve as important economic ores for the extraction of tungsten.

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