The relationship between tetrahedral aluminium and the maximum possible octahedral aluminium in natural calciferous and subcalciferous amphiboles

Leake, Bernard Elgey 1968. The relationship between tetrahedral aluminium and the maximum possible octahedral aluminium in natural calciferous and subcalciferous amphiboles. American Mineralogist 56 , pp. 843-851.

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Abstract

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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Subjects:	Q Science > QE Geology
Publisher:	Mineralogical Society of America
ISSN:	0003-004X
Last Modified:	04 Jun 2017 08:16
URI:	https://orca.cardiff.ac.uk/id/eprint/75229

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