Hydrozincite, Calcite, Yellow ? under Shortwave UV - Columbia Mine, Marion County, KY

The Columbia Mine in Kentucky can yield some really pretty specimens if you are persistent and crack enough rocks. The rarest color is the red/pink calcite shown on this piece. Every rock has hydrozincite, and many show the yellow we see here - not sure what that is - possibly fluorite. 2nd pic shows the piece under white light.

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