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Cardite, Zn 5.5 (AsO 4 ) 2 (AsO 3 OH)(OH) 3 ·3H 2 O, a new zinc arsenate mineral from Broken Hill, New South Wales, Australia
Mineralogy and Petrology ( IF 1.4 ) Pub Date : 2021-04-21 , DOI: 10.1007/s00710-021-00750-2
Peter Elliott

Cardite, Zn5.5(AsO4)2(AsO3OH)(OH)3·3H2O, is a new secondary mineral from the Block 14 Opencut, Broken Hill, New South Wales, Australia. Cardite occurs as radiating sprays of acicular crystals to 0.09 mm in length associated with anglesite, pyromorphite and köttigite. The mineral is white to pinkish white and pale tan with a white streak. Crystals are translucent with a vitreous lustre. The tenacity is brittle and the fracture is uneven. The calculated density is 4.02 g/cm3. Electron microprobe analyses (WDS mode) gave ZnO 43.39, CdO 7.26, CoO 1.24, MnO 0.59, FeO 0.12, As2O5 38.84, SO3 0.20, H2O (calc) 9.97, total 101.61 wt%. The empirical formula calculated on the basis of 18 oxygen atoms is (Zn4.75,Cd0.50,Co0.15,Mn0.07,Fe0.01)5.48[(AsO4)2.01(SO4)0.02]2.03(AsO3OH)(OH)2.89·2.98H2O. Cardite is orthorhombic, Cmcm, with unit-cell dimensions (100 K): a = 15.110(3), b = 15.492(3), c = 6.3850(13) Å, V = 1494.7(5) Å3 and Z = 4. The eight strongest lines in the X-ray powder diffraction pattern are [d(Å), (I), (hkl)]: 10.783 (100) (110), 7.564 (85) (200), 4.143 (48) (221), 3.328 (31) (041), 3.012 (20) (421), 2.763 (31) (222), 2.668 (24) (312), 2.451 (21) 260, 351, 461). The crystal structure of cardite (R1 = 0.067 for 13938 observed reflections with Fo > 4σ(Fo)) contains sheets of edge-sharing octahedra in which there is one vacancy for each four Zn cations in the sheet. Two orthogonal sheets lie parallel to (110) and to (1–10) and link along [001] by sharing common octahedra. AsO4 tetrahedra link to both sides of the sheet by corner-sharing. ZnO4 tetrahedra occupy channels in the structure and link to the sheets via corner-sharing AsO4 tetrahedra.



中文翻译:

Cardite锌5.5(AsO 4)2(AsO 3 OH)(OH)3·3H 2 O,一种新的砷酸锌矿物,来自澳大利亚新南威尔士州布罗肯希尔

Cardite锌5.5(AsO 42(AsO 3 OH)(OH)3 ·3H 2 O是一种新的次生矿物,来自澳大利亚新南威尔士州布罗肯希尔的Block 14 Opencut。心铁矿以针状晶体的辐射状喷雾的形式出现,长度为0.09毫米,与角铁矿,黄铁矿和钾钛矿有关。矿物为白色至粉红色白色,浅棕褐色,带有白色条纹。晶体是半透明的,带有玻璃光泽。韧性脆,断裂不均匀。计算出的密度为4.02g / cm 3。电子探针分析(WDS模式)得到ZnO 43.39,CdO 7.26,CoO 1.24,MnO 0.59,FeO 0.12,As 2 O 5 38.84,SO 30.20,H 2 O(计算值)9.97,总计101.61重量%。18个氧原子的基础上计算出的经验式是(锌4.750.50,钴0.15,锰0.07,铁0.015.48 [(ASO 42.01(SO 40.02 ] 2.03(ASO 3 OH)(OH)2.89 ·2.98H 2 O. Cardite为斜方晶,C MCM,具有晶胞尺寸(100 K):一个 = 15.110(3),b  = 15.492(3),C ^  = 6.3850(13)A,V = 1494.7(5)3ž  = 4。在X射线粉末衍射图案中的最强的8行是[d(A),(I),(HKL)〕:10.783(100)(110),7.564( 85)(200),4.143(48)(221),3.328(31)(041),3.012(20)(421),2.763(31)(222),2.668(24)(312),2.451(21) 260、351、461)。cardite的晶体结构(- [R 1 = 0.067为13938米与观察到的反射˚F ø >4σ(˚F ö))包含了共享边缘的八面体,其中存在用于在片材的每个4个锌阳离子一个空缺的片材。两个正交的图纸平行于(110)和(1–10),并通过共享共同的八面体沿[001]链接。AsO 4四面体通过边角共享链接到薄板的两面。氧化锌4个四面体占据结构中的通道,并通过角共享AsO 4四面体链接到薄板。

更新日期:2021-04-21
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