mineral
Sodalite with Syenite (Yooperlite)
Sodalite in Syenite (Na8(Al6Si6O24)Cl2)
AI-generated identification · may be incorrectHardness 5.5-6. Grayish rock base with bright orange/yellow fluorescence under UV light. Granular texture.
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Physical properties
Hardness 5.5-6. Grayish rock base with bright orange/yellow fluorescence under UV light. Granular texture.
Formation & geological history
Syenite rocks containing fluorescent sodalite, formed from igneous processes. Often found as glacial erratics.
Uses & applications
Collecting, lapidary arts, decorative items. Valued for its striking fluorescence.
Geological facts
Commonly known as 'Yooperlite', discovered relatively recently in Michigan. The glow is due to the mineral sodalite reacting to long-wave UV light.
Field identification & locations
Identify by shining a UV light (specifically 365nm) to reveal the bright orange glow against the dull gray syenite matrix.
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