Superlative example of preferential fluorite etching showing 'unaffected' yellow fluorite with partially dissolved later-stage blue. Note the surface of blue fluorite is relatively pristine and yellow phase has matte surface and a very-late stage purple fluorite present as 'stringer's within yellow. A dramatic and excellent specimen from mining in the North-End of the mine ca. 1986-1988. Tolonen Collection. Entered into Ross C. Lillie database as RCL2559.