During the past decades comprehensive investigations have been made on bentonite clays in order to find optimal components of the multi-barrier system of repositories for radioactive waste. The present study gives a mineralogical characterisation of some selected ...

In this paper, the mode of occurrence and the nature of dumortierite and its host gneisses are described, and some considerations on the environments related to the formation of dumortierite are given.

In this paper there are two related parts: First, description of certain textural and compositional features of zones in plagioclase phenocrysts from Fuego volcano, Guatemala. Second the use og features to correlate zones and arrive at a working hypothesis ...

<p>The weathering of biotite-plagioclase gneiss was studied in a warm humid climate under good drainage conditions, in De Kalb County, Georgia.</p>

This paper is about gneiss of argillaceous composition at Sturbridge, Massachusetts and at Union Connecticut that consists of the assemblage biotite-cordierite-garnetmagnetite-microcline-quartz-plagioclase-sillimanite.