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Bechererite is a new mineral found on dump material from the Tonopah-Belmont mine, Maricopa County, Arizona, U.S.A. It occurs as thin elongated crystals, commonly in hemispherical aggregates, and it is associated with rosasite, hydrozincite, willemite, smith- sonite, paratacamite, and boleite. Bechererite is light green, transparent with vitreous lus­ter, and has perfect cleavage parallel to {001}. It has a density of 3.45(5) g/cm 3  and a Mohs hardness of 2-3. Optically, it is uniaxial (-) with ε = 1.611(1) and ω = 1.705(1). The empirical formula (based on 21 O atoms) is (Zn 4.93 Cu 1.01 )Zn 2 (OH) 13 (S 1 . 10 Si 0.95 )[O 5.30 (OH) 2 . 70 ], simplified to (Zn,Cu) 6 Zn 2 (OH) 13 [(S,Si)(O,OH) 4 ] 2 . The strongest lines in the X-ray powder diffraction pattern are [d obs  (Å)(I obs ,hkl)] 7.37(100,001), 3.623(25,111̅), 3.282(30,012), 2.724(30,120), 2.556(50,121), and 1.572(20,410).

Bechererite, (Zn,Cu) 6 Zn 2 (OH) 13 [(S,Si)(O,OH) 4 ] 2 , a novel mineral species from the Tonopah-Belmont mine, Arizona