Bechererite, (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2, a novel mineral species from the Tonopah-Belmont mine, Arizona
Bechererite, (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2, a novel mineral species from the Tonopah-Belmont mine, Arizona
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Bechererite，(Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2，一种来自亚利桑那州托诺帕-贝尔蒙特矿的新型矿物
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发表时间：
1996
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通讯作者：
B. Rieck
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作者：
G. Giester;B. Rieck
白榴石是在美国亚利桑那州马里亚县托诺帕-贝尔蒙特矿的排土场中发现的一种新矿物，呈细长晶体，通常呈半球形集合体，与蔷薇辉石、水锌矿、硅锌矿、菱锌矿、副氯铜矿和玻陨石共生。白榴石呈浅绿色，透明，有玻璃光泽，解理平行于{001}。它的密度为3.45（5）g/cm 3，莫氏硬度为2-3。在光学上，它是单轴的（-），ε = 1.611（1）和ω = 1.705（1）。经验式（基于21个O原子）为（Zn4.93Cu1.01）Zn 2（OH）13（S1.10Si0.95）[O5.30（OH）2.70]，简化为（Zn，Cu）6 Zn 2（OH）13[（S，Si）（O，OH）4]2。X-射线粉末衍射图中最强的谱线为[dobs（λ）（Iobs，hkl）] 7.37（100，001）、3.623（25，111 λ）、3.282（30，012）、2.724（30，120）、2.556（50，121）和1.572（20，410）。晶体结构用直接法解出，并根据单晶X射线衍射数据（sin θ/λ = 0.48 <$-1）的281个独特反射点的数据，精确到R = 0.041 [空间群P3 <$，a = 8.319（2），c = 7.377（3）<$，V= 442.1（1）<$3，Z = 1]。的becherite的原子排列的特点是片的边共享八面体有序的空缺，互连的Zn 2 O 7组。孤立的XO 4四面体（X = S，Si）与八面体片的一个O原子共享一个共同的角。一个复杂的氢键系统发生在bechererite。
Abstract 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/cm3 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 (Zn4.93Cu1.01)Zn2(OH)13(S1.10Si0.95)[O5.30(OH)2.70], simplified to (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2. The strongest lines in the X-ray powder diffraction pattern are [dobs (Å)(Iobs,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). The crystal structure was solved by direct methods and refined to R = 0.041 on the basis of single-crystal X-ray diffraction data of 281 unique reflections up to (sin θ)/λ = 0.48 Å-1 [space group P3̅, a = 8.319(2), c = 7.377(3) Å, V= 442.1(1) Å3, Z = 1]. The atomic arrangement of bechererite is characterized by sheets of edge-sharing octahedra with ordered vacancies, interconnected by Zn2O7 groups. Isolated XO4 tetrahedra (X = S, Si) share a common comer with one O atom of the octahedral sheet. A complex system of hydrogen bonds occurs in bechererite.