Fluorite glows blue and purple under black light at the Sasahora Mine in Gero, Gifu Prefecture, in this picture taken with a 10-second exposure. The mine, which produces fluorite used to remove impurities in the steelmaking process, closed in 1971. However, popular tours of the mine have been held since 2016. A 9-year-old boy from Nara Prefecture who joined the tour with his family grinned and said, "I found a beautiful glowing stone."
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