Abstract
In the high-grade metamorphic Precambrian of the Sirdal-¢rsdal area,
Rogaland/Vest-Agder,south-west Norway, the Ca-amphiboles show a change
in pleochroic colours, not only with changes in metamorphic grade, but
also to some extend in bulk composition. A regional study was performed
on the amphiboles to study their response to changes in metamorphic
grade, the influence of the
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