Ferberite, Siderite Crystals on matrix - Height: 45 mm - Width: 35 mm- 36 g - (1)

Ferberite is a tungsten-rich member of the wolframite series, known for its dense, submetallic black crystals often forming tabular to prismatic shapes. Found in hydrothermal veins, ferberite typically occurs alongside siderite, a carbonate mineral that presents as rhombohedral or tabular crystals, commonly brownish in color. The natural combination of ferberite and siderite crystals on a matrix creates an attractive specimen, demonstrating contrasting forms and colors. These minerals hold interest both for collectors and for their industrial relevance, as tungsten is a critical metal used in hardness and heat resistance applications. Such specimens provide insight into the geological environments where tungsten deposits are formed.