An asymmetrically banded fissure vein from Clausthal, Germany, is described and illustrated. The writer shows that the veins could not have developed by deposition from homogeneous dilute or concentrated solutions, from colloidal solutions by processes of replacement, or by reopening and filling. The unique features of the veins are explained on the basis of immiscible solution pairs which originated, before splitting, as the result of fractionation of an earlier concentrated mineral solution.

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