Ep. 8: The Golden Elegy

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Shoko, whose shirt commemorates nihonium, explores water quality for her school science project. Ruri wants in on it. Between samples, Shoko finds and then loses an orange crystal. Yoko checks water quality as well, using it to locate a new fluorite deposit. More water tests lead the investigators to an abandoned factory. Inside, they find rare orange zincite. It serves as a pretty decoration and a symbol of Shoko's and Ruri's friendship. (Source: Wikipedia)