People visit the Hongshilin carbonatite cluster in Guzhang County, Xiangxi Tujia-Miao Autonomous Prefecture, central China's Hunan Province, June 28, 2015. The Hongshilin carbonatite cluster in Guzhang, the only red carbonatite cluster formed in the Cambrian Period in the world, has a history of about 450 million years. (Photo: Xinhua/Peng Biao)
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