Yooperlite
Sodalite-syenite containing fluorescent sodalite · Decorative Stone / Mineral Specimen
Crystal System
Cubic (for sodalite), granular to massive habit
Mineral Group
Silicates - Tectosilicates (Feldspathoid group)
Chemical Formula
Na8Al6Si6O24Cl2 (for the fluorescent Sodalite component)
Formation Process
Igneous intrusion of silica-undersaturated magma, where sodalite-rich patches crystallize within a syenite matrix
About This Crystal
An opaque, greyish-blue to dark grey syenite rock carved into a human skull shape, featuring striking neon-orange patches under ultraviolet light due to the presence of fluorescent sodalite inclusions
Physical Characteristics
Grey to brownish-gray body color, white streak, hardness of 5.5 to 6 on the Mohs scale, uneven to conchoidal fracture, specific gravity around 2.15 to 2.40, brittle tenacity, and vivid bright orange fluorescence under shortwave and longwave UV light
Optical Properties
Singly refractive (isotropic) for the sodalite component with a refractive index of approximately 1.483 to 1.487, vitreous to greasy luster, non-pleochroic
Hardness & Durability
Origin Region
Upper Peninsula of Michigan, USA, and recently found in other alkaline igneous complexes worldwide
Hardness & Durability
Mohs hardness of 5.5 to 6, moderate durability, suitable for ornamental carvings and occasional-wear jewelry with protective settings
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid harsh chemicals, ultrasonic cleaners, and prolonged exposure to strong acids which can etch the surface
Rarity & Value
Uncommon to rare depending on the saturation and distribution of the fluorescent sodalite; carved decorative items like skulls range from moderate to high value based on craftsmanship and UV glow intensity
Special Characteristics
Exceptional strong bright orange fluorescence under ultraviolet (UV) light due to sulfur-bearing sodalite components
Lore & History
Recently discovered around 2017, Yooperlite has quickly gained popularity in modern crystal healing communities for promoting self-acceptance, communication, and clearing the mind of negative thoughts, though these are symbolic and not scientifically validated properties