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► Size：Approximately 3.2"-3.6"（80 mm-90 mm）
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► Material: Shungite
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► Shungite is a black, lustrous non-crystalline mineraloid consisting of more than 98 weight percent of carbon. First described from a deposit near Shunga village, in Karelia, Russia, from where it gets its name. Shungite has been reported to contain fullerenes.