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On garnet in pelitic contact-zones

Published online by Cambridge University Press:  14 March 2018

C. E. Tilley*
Affiliation:
Sedgwick Museum, Cambridge

Extract

Of the garnet group of minerals, two members only appear to have been synthesized from artificial melts, viz. melanite (L. Michel, 1892) and spessartine (L. Bourgeois, 1883, and A. Gorgeu, 1883); though grossular is once reported by E. S. Shepherd, G. A. Eankin, and F. E. Wright (1909) as being produced by reaction under pressure of calcium orthosilicate and aluminium chloride. In dry melts, pyiope is represented by a cordierite-forsterite-spinel assemblage, but no data are yet available to indicate the dry melt assemblages representing almandine. The home of almandine in sediments is the dynamically metamorphosed pelite, and its widespread regional occurrence in these crystalline schists implies a ready synthesis under the influence of shearing stress.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1926

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References

page 49 note 1 Sollas, W. J., Sci. Proc. R. Dublin Soc, 1891, n. ser., vol. 7, p. 49 Google Scholar.