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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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Fluorescent/Phosphorescent Fluorite on Calcite, Pint's Quarry, Raymond, Iowa

29.12.2016

Amber-colored, cubic fluorite crystals on a bed of scalenohedral calcite, on limestone matrix, from Pint's Quarry, Raymond, Black Hawk Co., Iowa.  This specimen shows a similar fluorescent response under all UV wavelengths-  the fluorite cubes fluoresce bright off-white with bright and lasting phosphorescence.  The calcite fluoresces a dim blue/purple, with zones of blue phosphorescence following short wave UV.  The limestone fluoresces a soft tan color.  This specimen shows the brightest response under short wave UV.  The dimensions are 9.0 x 8.3 5.0 cm, and it weighs 388 grams.

 

Pint’s Quarry was a former dolomite/limestone quarry with workings more than 100 feet deep.  Closed in the late 1990s, Pint’s Quarry is now filled with water, and collecting is now prohibited.

 

 

 

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