Fluorite With Calcite and Sphalerite
Large Cabinet, 18.0 x 11.5 x 7.0 cm
Rosiclare Level, Minerva #1 Mine, Cave-in-Rock District, Hardin Co., Illinois, USA
Ex. Ross Lillie; Roy Smith
Straight out of the floating islands of Pandora (Avatar), the aesthetics of this Fluorite are dramatic and unique to one major pocket found circa 1992, here. The piece is like a layer cake, and trying to wrap your mind around how the geology would have allowed this to form is an exercise in futility. The multi-colored Fluorites at top and at bottom, where not etched, are cubic and partially zoned. It seems that most of the etching actually occurred with the yellow Fluorite layer between the two purple layers, and that it had a slightly different chemical composition. This is a fascinating example of preferential alteration of a specimen where it is all the same species, but different layers of the piece react differently to the environment of the pocket, or formed at different times. The photos tell the story. It is complete all around and even crudely on the bottom. The upper "tier" of this stadium-like specimen was loose - no surprise at all - and so was stabilized with glue by the previous owner, noted collector Roy Smith. It is an old glue job, and can be redone easily if desired, though you do not see it from the display face and I left it "as is" because it helps show how these things come out. I would label it as repaired, because it looks like without the glue, the top would come off and have to be reattached. ex Roy Smith collection to Ross Lillie in 2000 when he sold a large part of his collection..
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