A blue sodic amphibole occurs in mafic greenschists associated with a Precambrian iron deposit at Savage River, Tasmania. Its composition falls between magnesioriebeckite and actinolite. Crystallization of the amphibole probably reflects P, T conditions intermediate between glaucophane-lawsonite schist and greenschist facies, and demonstrates partial closing of the miscibility gap between sodic and calcic amphiboles at these conditions.

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