Elahera District, North Central Province, Sri Lanka

Large skarn corundum deposit.

Archean metamorphic rocks of the Highland group are developed in this region. The skarns are in the axial part of a large anticline near the base of a sequence of calcite-dolomitic marbles, which are underlain by quartz-syenite migmatites and overlain by charnockites, quartzites and biotite-garnet gneisses. The ovoid skarn body is 35 m long, maximum 12 m thick, and cuts across the axis of the fold.

The generation of transparent corundum is represented by greenish light blue and blue sapphire in prismatic and acute-pyramidal crystals, up to 1 cm long. Similar sapphires are found in placer deposits in this region.

Ref: E.Ya. Kievlenko, Geology of gems, 2003, p. 56

Gemstone List


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