This beautiful fluorite specimen is from the recent re-mining at Naica, which turned up some specimens of terrific quality. With this specimen, you see the typical extremely complex faces, with some rather distinct cuboctahedrons emerging from the background of microfaces. These euhedral areas provide clear windows into the transparent, light green interior of the compound crystal. The crystal is complete all around, with a contact face underneath where you can still see a bit of sphalerite.
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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