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Nature’s Rainbows is a non-commercial web site maintained entirely by volunteer hobbyists and contributors.  Our mission is to provide information about UV and luminescence, premium fluorescent mineral photos, and a fluorescent mineral database for the enjoyment of FL mineral collectors around the world.  Information on this web site is covered under a Creative Commons License.


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Terlingua Calcite- Terlingua, Texas

11.11.2016

Terlingua calcite is one of the most spectacular and beautiful fluorescent minerals due to its bright, multi-colored, multi-wave, fluorescent response, and bright, persistent phosphorescence.  Terlingua calcite shows bright blue fluorescence under short wave UV, with bright and long-lasting phosphorescence.  Under long wave UV, the fluorescent response is bright pink.  True Terlingua calcite comes from only one source- the mercury mines of Terlingua, Brewster County, Texas, with the most notable location being the Little 38 Mine, located 4 miles west of Terlingua.  These mines have been closed for years, and many have been reclaimed, making the collection of new material very difficult, if not impossible.  Calcite showing a similar fluorescent response, but collected from other locations, is referred to as “Terlingua-type” calcite.  The size of this specimen of Terlingua calcite is 13.3 x 6.4 x 5.4 cm, and it weighs 333 grams.

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