saf-ahyuh r

Named after Niels Viggo Ussing, professor of Mineralogy at the University of Copenhagen, this rare silicate mineral can be found in only a few locations worldwide including Greenland and northern Russia. It typically has a massive habit and can be light pink, lilac-blue, and in rare cases dark violet-red.

Ussingite Polished
Ussingite Classification
Common Name Ussingite
Species Ussingite
Ussingite Optical Properties
Transparency Transparent - Translucent
Refractive Index 1.545-1.509
Birefringence 0.041
Optic Character Biaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: Inert
LWUV: inert
Pleochroism Unobservable
Ussingite Characteristic Physical Properties
Hardness 6-7
Specific Gravity 2.457-2.500
Toughness Poor
Luster Vitreous, Greasy
Stability Brittle
Fracture Irregular, Uneven
Cleavage Perfect
Ussingite Chemistry & Crystallography
Chemical Name sodium aluminum silicate hydroxide
Chemical Formula Na4Al2Si6O17.H2O
Crystal System Triclinic
Chemistry Classification Silicate

Ussingite Colors

  • Pink Ussingite Pink
  • Purple Ussingite Purple

Countries of Origin

Canada; Russian Federation (the); Denmark

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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.