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12 mm crystal of Helvite (orange) in matrix of feldspar (pink) with microcrystals of muscovite (green), from Tongbai County, Nanyang Prefecture, Henan Province, China
12 mm crystal of Helvite (orange) in matrix of feldspar (pink) with microcrystals of muscovite (green), from Tongbai County, Nanyang Prefecture, Henan Province, China