XL 2
This is one of the largest and most spectacular pieces I have found at the Kelly Mine, Magdalena, New Mexico.  The surface of this face has a combination of violet Smithsonite, red Calcite, and a small area of blue/white Hydrozincite, as shown under shortwave UV.  Needs a strong lamp to bring out colors well.  A second face has a similar assemblage minus the Hydrozincite.  Dimensions are 9 1/2 x 5 x 4 inches.  Weight is 25 lbs.  Price: $175.