Quartz, Cave-In-Rock, Illinois

The Cave-In-Rock area of Hardin County, Illinois, is best known to collectors for its historical production of world-class specimens of fluorite.  However, the mines of that area produced many other minerals as well, some of which are fluorescent.  This is a specimen of quartz crystals from Cave-In-Rock that shows an interesting fluorescent response under both short and long wave UV due to the presence of hydrocarbon, and other organic, activators.  The size of this specimen is 76 x 64 x 37 mm, and it weighs 184 grams.

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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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