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The majority of gem-quality zincite in the market is the byproduct of Polish metal refineries where the material crystallized in the factory smokestacks and was then harvested during cleaning. Zincite can also be found naturally in a few localities, most notably associated with metamorphosed zinc ore bodies in Sterling, New Jersey, though the crystals are rarely of gem quality.

Zincite Polished
Zincite Classification
Common Name Zincite
Species Zincite
Zincite Optical Properties
Transparency Transparent - Opaque
Dispersion Strength: Weak Fire Value: 0.127
Refractive Index Over The Limit 2.013-2.029
Birefringence 0.016
Optic Character Uniaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: Inert to moderate yellow to orange or yellow-green
LWUV: Inert to moderate yellow to yellow-orange
CCF Reaction Yellow: Inert to yellowish-green; Orange stone: weak pink; Reddish-orange: moderate red
Pleochroism Unobservable
Zincite Characteristic Physical Properties
Hardness 4
Streak Orange-Yellow
Specific Gravity 5.640-5.680
Toughness Poor
Luster SubAdamantine
Fracture Subconchoidal
Cleavage Perfect, in one direction
Zincite Chemistry & Crystallography
Chemical Name zinc manganese oxide
Chemical Formula (Zn,Mn2+)O
Crystal System Hexagonal
Chemistry Classification Oxide

Zincite Colors

  • Red Zincite Red
  • Orange Zincite Orange

Alternate Names

Red-Zinc Ore

Countries of Origin

United States of America (the)

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Tim Matthews


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.