Ferberite

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Ferberite is an iron-rich mineral commonly seen as a black to dark gray prism-shape specimens with metallic luster. At times it can exhibit weak magnetism and should not be confused with hematite.

Ferberite Polished
Ferberite Classification
Common Name Ferberite
Species Ferberite
Ferberite Optical Properties
Transparency Semitranslucent - Opaque
Refractive Index Over The Limit 2.255-2.414
Birefringence 0.159
Optic Character Biaxial
Optic Sign Positive
Polariscope Reaction Doubly Refractive (DR)
Pleochroism None
Ferberite Characteristic Physical Properties
Hardness 4-4.5
Streak Brownish Black To Black
Specific Gravity 7.500-7.600 Typical:7.580
Toughness Poor
Luster Adamantine, Metallic
Fracture Uneven
Cleavage Perfect, in one direction
Ferberite Chemistry & Crystallography
Chemical Name iron tungstate
Chemical Formula FeWO4
Crystal System Monoclinic
Chemistry Classification Oxide

Countries of Origin

China

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Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.