The relationship between tetrahedral aluminium and the maximum possible octahedral aluminium in natural calciferous and subcalciferous amphiboles
The relationship between tetrahedral aluminium and the maximum possible octahedral aluminium in natural calciferous and subcalciferous amphiboles
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作者：
B. Leake
对现有的936个钙化和亚钙化角闪石的分析进行了严格的检查，得出的结论是，最大可能的A16随着Ala的增加而有规律地增加。在任何Al{值下允许的最大A16是经验得到的。新的化学分析，加上新的光学测定，给出了三个先前描述的角闪石，从马德拉斯和北卡罗来纳，似乎含有超过最大允许的A16。新的分析表明，两个马德拉斯角闪岩的A16含量远远低于最大可能的A16含量，而北卡罗来纳样品的A16含量最高。
Critical examination of a plot of 936 available analyses of calciferous and subcalciferous amphiboles leads to the conclusion that the maximum possible A16 increases regularly as the Ala increases. The maximum allowed A16 at any Al{ value is empirically obtained. New chemical analyses, together with new optical determinations, are given for three previously described amphiboles, from Madras and North Carolina, which appeared to contain more than the maximum allowed A16. The new analyses show that the two Madras amphiboles contain much less than the maximum possible A16, whereas the North Carolina sample contains the most A16 allowed ior its All content.