What is Ferberite?
Ferberite is the iron-rich end-member of the wolframite series, a dense tungsten mineral found in hydrothermal veins and granite-related ore deposits.
Mineralogy and structure
Reference formula: FeWO4. Ferberite has the monoclinic wolframite structure and the ideal formula FeWO4. Natural wolframite commonly lies between ferberite and hübnerite, so a species label should follow locality or analytical evidence.
Colour and appearance
Typical colours include black, brown-black, dark grey. The usual tabular, prismatic, granular habit and sub-metallic, resinous lustre are useful descriptive features, but colour alone is not diagnostic.
Formation and localities
Ferberite forms in or is associated with high-temperature hydrothermal veins, greisens and granite-related tungsten deposits. Important documented localities include Portugal, Bolivia, China, Spain, Germany, the United Kingdom and the United States.
Collecting and care
Very dense and brittle at crystal edges; keep labelled and avoid using unknown tungsten ore in cutting or decorative work.
Weight, density and the wolframite series
The unusually high density of Ferberite is one of the first things a collector notices. In symbolic writing, that physical weight may be used as a metaphor for steadiness or seriousness, but it does not imply an effect on health or energy.
Traditional associations
There is no universally accepted zodiac association for Ferberite. Any proposed link belongs to modern crystal folklore and should not be presented as part of its identification.
