MineralArtsMineralArts.com has some beautiful images of southern Arizona fluorescent minerals.

The fluorescent rocks displayed were collected in the mountains of southern Arizona. The rocks consist of calcite and aragonite with minor amounts of opal, sphalerite, and amphiboles. The fluorescence is the result of minor impurities in the minerals slightly altering chemical bonds in the crystal structures of the minerals. The limestone host rock was subjected to hydrothermal alteration as a result of the nearby intrusion of magma. At least two episodes or pulses of hydrothermal fluids passed through the limestone, one of which carried the trace element(s) responsible for the fluorescence. The hydrothermal alteration of the limestone resulted in the dissolution of portions of the limestone and deposition of calcite veins, overgrowths, and cavity fillings in the rock. The limestone was later chemically weathered, again leading to dissolution of the rock and the deposition of aragonite (travertine) in dissolution cavities.

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