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Abstract
Introduction
Geologic setting
Previous mineralogical and geochemical work
Alteration of the water-laid tuff
Petrography of unmineralized tuff
Petrography of mineralized tuff
Chemical composition
Alteration patterns at the Roadside ore deposit
Alteration nodules in tuff
Calcite-silica-fluorite nodules
Fluorite-clay-manganese oxide nodules
Discussion and conclusions
Alteration processes
Chemical transport and precipitation mechanisms
Origin of the Spor Mountain beryllium deposits
References cited.

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