Fine yooperlite skull Under proffesional uv light the skull is highly glowing Yooperlite is a type of fluorescent mineral that is primarily found in the Upper Peninsula of Michigan. It's a variety of syenite and is notable for its unique glow under ultraviolet light, which is due to the presence of sodalite. When exposed to UV light, Yooperlite can emit a bright blue or green fluorescence, making it a popular choice for collectors and those interested in geology. Wordt aangetekend en verzekerd verzonden.