Tugtupite
Tugtupite (Sodalite Group) · Collector Mineral / Rare Semi-Precious Gemstone
Crystal System
Tetragonal; typically occurs in massive, granular, or fine-grained aggregates rather than distinct crystals.
Mineral Group
Silicates (Tectosilicates); Sodalite Group
Chemical Formula
Na4AlBeSi4O12Cl (Sodium Aluminum Beryllium Silicate Chloride)
Formation Process
Hydrothermal; it forms in late-stage hydrothermal veins and pegmatites within alkaline igneous rocks (nepheline syenites).
About This Crystal
Tugtupite is famous for its pink to crimson red color, often occurring as mottled patches within a white, grey, or black matrix. It has a vitreous to dull luster and is typically translucent to opaque. It is highly valued for its intense tenebrescence and fluorescence.
Physical Characteristics
Color ranges from white to pale pink to intense deep red. Streak is white. It has indistinct cleavage and an uneven to conchoidal fracture. Specific gravity is approximately 2.36. It is brittle and known for displaying strong fluorescence.
Optical Properties
Uniaxial (+); Refractive index is 1.490–1.502. It exhibits tenebrescence (photochromism)—the color intensifies when exposed to UV light or sunlight and fades in the dark.
Hardness & Durability
Origin Region
Primarily the Ilimaussaq intrusive complex in Greenland (the type locality); also found in Mont Saint-Hilaire, Canada and the Kola Peninsula, Russia.
Hardness & Durability
Mohs hardness is 4.0 to 6.0. It is relatively soft and brittle, making it more suitable for cabochons or collector specimens than high-wear jewelry like rings.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners and harsh chemicals. Store away from harder gemstones to prevent scratching. Note that the color may change based on light exposure.
Rarity & Value
Very Rare. Higher value is placed on specimens with deep, uniform pink-to-red saturation and strong tenebrescence. Most material is sold as mineral specimens or polished cabochons.
Special Characteristics
Strong tenebrescence (darkens/reddens in sunlight); Brilliant fluorescence (strong salmon-pink or bright red under short-wave UV light, weaker under long-wave).
Lore & History
Discovered in 1962 in Greenland. Inuit legend associates the stone with 'Tutu' (the reindeer girl) and the blood of her heart, symbolizing deep love and passion. In modern mineral lore, it is often called the 'Reindeer Stone' and associated with the heart chakra.