Check the listing for details. HUGE Phosphorescent Willemite/Calcite Specimen Shortwave UV 2 Lbs 5 Oz!!. Condition: New. Listed at 72.99 USD. A very phosphorescent Willemite specimen, fluorescent Willemite and Calcite that glow brightly under Shortwave UV (254 nm) and glow less brightly under longwave UV (365 nm). The phosphorescence is activated by shortwave UV and lasts for up to 20 seconds after the light is turned off!! 1st picture shows Shortwave, last picture shows Longwave. Weight: 37.71 ounces Origin: Franklin, New Jersey
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