Tugtupite
Tugtupite (IMA-approved), variety of Sodalite group · Collector Mineral / Rare Semi-Precious Gemstone
Crystal System
Tetragonal system; usually found in massive or granular habits, rarely as small pyramidal crystals.
Mineral Group
Silicates (Subgroup: Tectosilicates, Fluorchlorosilicates)
Chemical Formula
Na4AlBeSi4O12Cl (Sodium Aluminum Beryllium Silicate Chloride)
Formation Process
Found in hydrothermal veins and pegmatites within alkalic igneous rocks (syenites). Formed under high alkalinity and relatively low pressure and temperature.
About This Crystal
The specimen is a polished tumbled stone appearing mottled pink to magenta with white and black inclusions. It exhibits a vitreous to greasy luster and varies from translucent to opaque. The color is often uneven and blotchy.
Physical Characteristics
Color: Pink to deep crimson; Streak: White; Cleavage: Fair/Distinct; Fracture: Conchoidal to uneven; Specific Gravity: 2.33–2.36; Fluorescence: Strong red/orange under LWUV and salmon-pink under SWUV.
Optical Properties
Refractive Index: 1.494–1.504; Birefringence: 0.006–0.008; Uniaxial (+); Known for Tenebrescence (color deepens in sunlight/UV and fades in dark).
Hardness & Durability
Origin Region
Primarily the Ilimaussaq intrusive complex in South Greenland; also found in Kola Peninsula (Russia) and Mont Saint-Hilaire (Canada).
Hardness & Durability
Mohs hardness: 4 to 6. It is relatively soft and brittle; unsuitable for rings without protective settings but fine for pendants or collector display.
Care & Maintenance
Avoid ultrasonic cleaners and steam. Clean with warm soapy water and a soft cloth. Store in the dark to preserve its tenebrescent properties, as prolonged exposure to extremely high heat can damage the color center.
Rarity & Value
Rare to very rare. Value is determined by the intensity of the pink-red color and the strength of its tenebrescent 'chameleon' effect. High-quality Greenland specimens fetch the highest prices.
Special Characteristics
Strong Tenebrescence (photochromism) where the pink color intensifies when exposed to UV light or sunlight. It is also highly fluorescent under ultraviolet light.
Lore & History
Discovered in 1962 in Greenland. Inuit legend says it is formed from the blood of Tutu (the reindeer girl) and symbolizes romance. In crystal healing, it is associated with the heart chakra and emotional expansion.