Willemite is a fluorescent metamorphic rock with the unusual property of fluorescing only in the short wave UV. Now you can teach that there are multiple colors of UltraViolet! Using a UVC lamp (not blacklight), the rock will glow green. But, covering the rock with a glass slide will demonstrate that only short wave UV light is blocked by glass. This proves that glass is only transparent to visible light, not all electromagnetic waves. Therefore, if one wishes to do experiments with short wave UV light, then a special type of glass is needed. The answer is Quartz. Quartz Glass is pure silicon dioxide and will transmit the UVC Light. Kit contains 1 Willemite metarorphic rock, 1 glass slide, and 1 quartz slide.
UVC lamp P3-6550
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