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Christelite: Zn3Cu2(SO4)2(OH)6·4(H2O) Paratacamite: (Cu,Zn)2(OH)3Cl
Comments: Robins-egg blue christelite with dark green paratacamite on matrix. Location: San Francisco mine, Sierra Gorda, Chile. Scale: 3 cm. © John Veevaert