Tugtupite

Tugtupite is named after Tugtup agtakôrfia Ilimaussaq intrusive complex of southwest Greenland where it was first found in 1957 (in some sources 1962).

Tugtupite is tenebrescent: warmth and exposure to ultraviolet light from the sun or a lamp intensifies its colour (from pale pink to cyclamen red).

Tugtupite is also called a Reindeer stone.

Tugtupite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 

Tugtupite Gemstones by Size

This table shows distribution of Tugtupite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:1.47 cts
Heaviest:37.57 cts
Average:15.65 cts
Total photos:4
Do you have a larger Tugtupite? Why not upload a photo?
1.47ct to 5.08ct5.08ct to 8.69ct8.69ct to 12.30ct12.30ct to 15.91ct15.91ct to 19.52ct19.52ct to 23.13ct23.13ct to 26.74ct26.74ct to 30.35ct30.35ct to 33.96ct33.96ct to 37.57ct
General Information
Chemical Formula
Na
 
4
AlBeSi
 
4
O
 
12
Cl
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Photos of natural/un-cut material from mindat.org
Physical Properties of Tugtupite
Mohs Hardness5.5 to 6
Walter Schumann, Gemstones of the world (2001)
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Specific Gravity2.30 to 2.60
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Cleavage QualityDistinct
Arthur Thomas, Gemstones (2009)
FractureUneven,Conchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Tugtupite
Refractive Index1.494 to 1.504
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Optical CharacterUniaxial/+
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Birefringence0.008
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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PleochroismModerate
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Common white to black mottling
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Causes of ColourPink, color center(s) involving sulphur
W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011)
TransparencyOpaque
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Mostly opaqueMore from other references
LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (General)Tugtupite shows an attractive fluorescence with the red response to UV appearing stronger in SW than in LW.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Fluorescence (Short Wave UV)Salmon red
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Fluorescence (Long-Wave UV)Orange
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Crystallography of Tugtupite
Crystal SystemTetragonal
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitPseudocubic, showing short prisms with pyramids and sphenoids
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Tugtupite occurs in hydrothermal veins cutting sodalite syenite and syenite.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Inclusions in Tugtupite
May contain black needles or yellow spots - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 9
Further Information
Mineral information:Tugtupite information at mindat.org
Significant Gem Localities
Denmark
 
  • Greenland
    • Kujalleq
      • Narsaq
        • Ilímaussaq complex
          • Tunulliarfik Fjord (Tunugdliarfik)
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 461
Russia
 
  • Murmansk Oblast
    • Lovozero Massif
      • Alluaiv Mt
        • Umbozero mine (Umbozerskii mine; Umba Mine)
Copyright © Jolyon & Katya Ralph 1993-2019. Site Map. Locality, gem & photograph data are the copyright of the individuals who submitted them. For more information please contact the . Gemdat.org is an online information resource dedicated to providing free gemmological information to all.