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Determination of the Composition of Garnets without Chemical Analysis

 

作者: Rudyard Frietsch,  

 

期刊: Geologiska Föreningen i Stockholm Förhandlingar  (Taylor Available online 1957)
卷期: Volume 79, issue 1  

页码: 43-51

 

ISSN:0016-786X

 

年代: 1957

 

DOI:10.1080/11035895709449112

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

In the present paper an account is given of the extent a determination of only the unit cell dimension and the refractive index may be used to predicte the composition of a garnet. For this purpose 17 analysed garnets were investigated, the unit cell dimensions and the refractive indices are shown in Table 1. By using fig. 1 and 2, in which the unit cell size and the refractive index of 60 analysed garnets have been combined, it is possible to obtain a characterization accurate enough to be used in petrogenetical problems. To distinguish accurately between an almandite and a spessartite partial chemical analysis for manganese is necessary. From fig. 2 it seems clear, however, that a garnet with n > 1.80 and < 1.82 is not especially rich in spessartite.

 

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