Abstract
Fine-grained proterozoic metagreywackes from Matope Falls, Cuyuni River, contain abundant actinolite rimmed by green hornblende. Both amphiboles also coexist in the matrix-apparently due to a miscibility gap between the two. At the intrusive contact of a granodiorite the rocks have been further metamorphosed to hornblende hornfelses in which hornblende has exsolved cum-mingtonite lamellae. Optical and unit-cell data are given.
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