Tugtupite

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Tugtupite gets its unique name from the location of its discovery in southwest Greenland. This semi-transparent to opaque mineral species is usually pink to red and often mottled with white, gray or black. Nicknamed the "Reindeer Stone," tugtupite is tenebrescent; when stored in darkness, the gem's color will fade, but returns immediately upon exposure to daylight. Among collectors, tugtupite is also prized for its luminescent properties: strong fluorescence and less commonly, phosphorescence, when the gem continues to fluoresce even after the ultraviolet light source has been removed.

Tugtupite Polished
Tugtupite Classification
Common Name Tugtupite
Species Tugtupite
Tugtupite Optical Properties
Transparency Translucent - Opaque
Refractive Index 1.496-1.502
Birefringence 0.006
Optic Character Uniaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: Inert to strong red to orange red
LWUV: Inert or red to orange red
CCF Reaction None
Pleochroism Dichroic, moderate purplish red and orange-red
Tugtupite Characteristic Physical Properties
Hardness 4
Specific Gravity 2.300-2.580 Typical:2.360
Toughness Poor
Luster Vitreous, Greasy
Fracture Conchoidal, Uneven
Cleavage None
Tugtupite Chemistry & Crystallography
Chemical Name Sodium Aluminum Beryllium Silicate Chloride
Chemical Formula Na4AlBeSi4O12Cl
Crystal System Tetragonal
Chemistry Classification Silicate

Tugtupite Colors

  • Pink Tugtupite Pink
  • Red Tugtupite Red

Alternate Names

Reindeer Stone

Countries of Origin

Canada; Russian Federation (the); Greenland

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Tim Matthews

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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.