Section 20
Chapter 19,749

Porcellanite in the Mishash Formation, Negev, southern Israel

Kolodny, Y.; Nathan, Y.; Sass, E.

Journal of Sedimentary Petrology 35(2): 454-463


ISSN/ISBN: 0022-4472
Accession: 019748830

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The porcellanite occurs in association with chert in the lower part of the Mishash formation (Cretaceous). It is composed mostly of opal and is highly porous. It is believed to have formed by diagenesis in a semiclosed basin in the vicinity of a continent with low relief, under tropical climatic conditions in an environment in which pH determined whether opal or quartz formed.

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