Metagabbro in the vicinity of Baie Verte, Newfoundland, has been altered to an aggregate of zoisite and prehnite. Microscopic study shows zoisite intimately penetrated by a network of prehnite veinlets. Chemical analyses indicate a large increase in lime and decrease in silica, iron, magnesium and alkali content. The alteration is attributed to hydrothermal solutions probably related to the nearby granitic rocks.

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