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Clay Minerals; March 2004; v. 39; no. 1; p. 47-55; DOI: 10.1180/0009855043910119
© 2004 Mineralogical Society of Great Britain and Ireland
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Research Paper

Mineralogy and chemistry of natrolite from Jordan

K. IBRAHIM*

Department of Earth and Environmental Sciences, Hashemite University, P.O. Box 150459, Zarqa 13115, Jordan

* E-mail: ibrahim{at}hu.edu.jo

(Received 28 May 2003; revised 10 October 2003)

A natrolite-cemented palagonite ash tuff unit is reported in a palaeo-basin in northeast Jordan. Phillipsite and chabazite are also identified. The zeolites were formed due to transformation of volcanic glass granules into palagonite by the reaction with percolating water in a closed hydrological system. Consequently, Si, Al, Ca, Na and K are leached out and precipitated in a series of authigenic layers developed at the extreme edge of the granules. The recorded paragenetic sequence is smectite -> phillipsite -> chabazite -> natrolite -> analcime -> calcite. The natrolite studied is chemically similar to those reported in the literature with minor variations. The phillipsite and chabazite studied are chemically different from the other Jordanian phillipsite and chabazite reported. The latter are chemically equivalent to those formed under open hydrological systems, whereas the phillipsite and chabazite in this study are chemically equivalent to those formed in saline lakes and arid soil environments. This conclusion is based on the (Na+K)/(Na+K+Ca+Mg) ratio and the Si/Al ratio.

KEYWORDS: natrolite, phillipsite, chabazite, zeolite, Jordan




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E. Ciftci, J. P. Hogan, H. Kolayli, and E. Cadirli
NATROLITITE, AN UNUSUAL ROCK - OCCURRENCE AND PETROGRAPHIC AND GEOCHEMICAL CHARACTERISTICS (EASTERN TURKEY)
Clays and Clay Minerals, April 1, 2008; 56(2): 207 - 221.
[Abstract] [Full Text] [PDF]


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