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Iron-Rich Bustamite from Broken Hill, Australia: The Crystal Structure and Cation-Ordering Features

机译:澳大利亚布罗肯希尔(Broken Hill)的富铁白铁矿:晶体结构和阳离子有序特征

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摘要

A specimen of iron-rich bustamite from the Broken Hill deposit (Australia) has been studied by single-crystal X-ray diffraction and by Mossbauer and IR spectroscopy. The triclinic unit-cell parameters are as follows: a = 7.1301(4) , b = 7.6940(3) , c = 7.7345(4) , alpha = 79.352(4)A degrees, beta = 62.951(6)A degrees, gamma = 76.149(3)A degrees, V = 365.49(3) (3), sp. gr. . The structure is solved by direct methods and refined to R = 5.22% based on 7298 reflections with |F| > 4 sigma(F). The mineral under study is similar in composition and structure to the Fe-rich bustamite described earlier. It is found that all iron atoms are in the divalent state and occupy the M1 and M3 sites in a ratio of 33: 67. The idealized formula of iron-rich bustamite from Broken Hill (Z = 1) is Mn2Ca2(Fe,Mn)Ca[Si3O9](2).
机译:已通过单晶X射线衍射以及Mossbauer和IR光谱研究了来自Broken Hill矿床(澳大利亚)的富铁白云母样品。三斜晶胞参数如下:a = 7.1301(4),b = 7.6940(3),c = 7.7345(4),alpha = 79.352(4)A度,beta = 62.951(6)A度,伽马= 76.149(3)A度,V = 365.49(3)(3),sp。 gr。 。通过直接方法求解该结构,并基于| F |的7298次反射将其精炼为R = 5.22%。 > 4 sigma(F)。所研究的矿物的成分和结构与之前所述的富铁白云母相似。发现所有铁原子均处于二价状态,并以33:67的比例占据M1和M3位置。Broken Hill(Z = 1)的富含铁的白铁矿的理想化公式为Mn2Ca2(Fe,Mn) Ca [Si3O9](2)。

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