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Hemimorphite: Zn4Si2O7(OH)2·(H2O)
Comments: Lustrous, mostly colorless to slightly reddish-brown hemimorphite crystals, the largest 13 x 20 x 2 mm in size. Location: Santa Eulalia, Chihuahua, Mexico. Scale: 25 x 10 x 25 mm. © Dan Weinrich