Original paper

Order-disorder in natrolite-group minerals

Alberti, Alberto; Cruciani, Giuseppe; Dauru’, Ilaria

European Journal of Mineralogy Volume 7 Number 3 (1995), p. 501 - 508

35 references

published: May 19, 1995
manuscript accepted: Jan 25, 1995
manuscript received: Sep 21, 1994

DOI: 10.1127/ejm/7/3/0501

BibTeX file

ArtNo. ESP147050703004, Price: 29.00 €

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Abstract The structure refinement of a natrolite from Palagonia (Sicily, Italy), closely intergrown in gonnardite, has been carried out in order to study order-disorder in tetrahedral sites of natrolite-group minerals. About 20% of Al has been found in Sil and Si2 sites and 30% of Si in the Al site. The results of this structural refinement and those of literature, together with chemical data, suggest that complete disorder cannot be reached in hydrothermal natrolites. The complete disorder found in gonnardites, where Si/Al 1.5, is interpreted as the dehydration product of paranatrolite, whose high H2O content and complete disorder in tetrahedral sites is attributed to unusual genesis (high temperature and H2O pressure). Accordingly, a definition of natrolite, gonnardite, tetranatrolite, and paranatrolite is suggested


natrolitegonnarditetetranatroliteparanatroliteSi-Al order-disorder.