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Much of the calcite in these marbles shows oriented columnar structures that are interpreted as pseudomorphs of prismatic aragonite.

The two main lower marble horizons are typically dolomitic, in part, and are separated by intercalated glaucophane schists, epidote–white mica schists, greenschists (retrograde), and minor quartzites and manganese cherts.

Based on calculated mineral equilibria, the assemblages and mineral compositions in the marbles and associated rocks place narrow constraints on the metamorphic P–T path and the grain-boundary fluid composition of the marbles.

The occurrence of glaucophane Ca CO stability of assemblages common in the schist and marble constrains the P and T maxima for these rocks to about 500°C and 15–16 kbar.

Metamorphosed admixtures of carbonate and mafic silicate material yielded minerals that are typical for eclogite facies and blueschist facies.

These impure marbles are widespread and contain assemblages of various combinations of glaucophane/ferroglaucophane, Na-pyroxene (omphacite to jadeite), epidote, garnet, paragonite and phengitic white mica.

With the exception of the Vari gneiss in the SE, the rocks contain high-pressure mineral assemblages reflecting conditions of at least 15 kbar and about 500°C (Dixon & Ridley, 1987; Okrusch & Bröcker, 1990).

Unit I is a sequence of volcano-sedimentary rock types (schists and marble in Fig. The lowermost rocks of Unit I that are exposed in the southern part of the island consist of metamorphosed felsic tuffs that may contain felsic clasts, mafic schists, minor marbles, and finely laminated manganese cherts.

Above these marbles, metaquartzites and mafic and mica schists with manganese cherts (coticules) are present.