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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