Titre du document / Document title

HYDROBASALUMINITE FROM CLAYS OF THE MIDDLE APTIAN (SARATOV REGION)

Auteur(s) / Author(s)

SALTYKOV V. F. ;

Résumé / Abstract

Resampling and the study of material by diffractometric, thermogravimetric, chemical and optical methods have shown that the 'paraluminite', discovered by P. P. Pilipenko in 1927, turn out to be hydrobasaluminite. X-ray characteristics of the mineral and its dehydrated variety (basaluminite) are well corresponding to the most complete data provided by T. Clayton (1980). Contrary to the crystallization water amounts accepted in the reference books (5 molecules), combined results of the thermal and chemical analysis proved basaluminite to comprise 4 water molecules, and hydrobasaluminite ― 14 molecules. Natural samples represent basaluminite and metabasaluminite mixtures with hydrobasaluminite admixtures. Schemes of the minerals dehydration are given. Established consequence of the mineral-forming (gypsum ― aluninium sulfates ― allophane) is caused by the gradual binding of sulfate ion and simultaneous increase of pH in the initially sulfurous solutions.

Revue / Journal Title

Zapiski Vserossijskogo mineralogičeskogo obŝestva   ISSN 0869-6055 

Source / Source

2009, vol. 138, n^o1, pp. 72-83 [12 page(s) (article)]

Langue / Language

Russe

Editeur / Publisher

Nauka, Sankt-Peterburg, RUSSIE, FEDERATION DE  (1992) (Revue)

Localisation / Location

INIST-CNRS, Cote INIST : 4673, 35400018835059.0060