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A Formation of Marekanite at El Fiscal, Guatemala

Published online by Cambridge University Press:  01 May 2009

Pontus Ljunggren
Pontus Ljunggren
Affiliation:
Department of Mineralogy and Geology, The University, Lund, Sweden.
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Abstract

An outcrop of obsidian pebbles in a grey volcanic rock was investigated in the field and subsequently examined in the laboratory by means of optical, X-ray, and D.T.A. methods. The results show that the grey rock arose from obsidian through a micro-cracking, causing a formation of marekanite balls (massive obsidian) surrounded by a very brittle grey rock (micro-cracked but completely unaltered volcanic glass).

Type
Articles
Information
Geological Magazine , Volume 97 , Issue 1 , February 1960 , pp. 49 - 52
Copyright
Copyright © Cambridge University Press 1960

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References

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