Longwave Fluorescent Minerals

Minerals that are fluorescent under LW UV (350nm to 400nm, some 405nm laser - often referred to as a blacklight)
(View all wavelengths on the main page)

The Electric Opal Claim in Zacatecas, Mexico produced specimens of hyalite opal that were notable for having brilliant green fluorescence under UV, and bright yellow/green daylight fluorescence when viewed under shaded daylight outdoors.  The opal was found in welded v...

This large specimen from the Graymont Quarry in Genoa, Ohio features colorless, transparent fluorite cubes with root beer brown, zoned centers on a light grey limestone matrix.  There are also some white bladed celestine crystals present.  As shown in the photographs b...

This is a brightly fluorescent cluster of root beer brown colored fluorite cubes, with white bladed celestine crystals, from the Graymont Quarry, Genowa, Ottawa County, Ohio.  The bright fluorescent response is activated by organic inclusions in the fluorite crystals....

Pink grossular dodecahedrons and yellow non-fluorescent vesuvianite in a matrix of quartz and calcite, from the famous deposit in Sierra de Cruces. The garnets are dim fluorescent red in long wave and mid wave, likely from Cr3+ impurities. Also included are macro close...

Nodules of barite and aragonite are perched on an underlying base of celestine and fluorite on this beautiful specimen from the Annabel Lee Mine, Cave-In-Rock, Hardin County, Illinois.  Under all UV wavelengths, this piece shows a lovely pastel fluorescent response.  T...

This is an excellent example of brightly fluorescent amber, from a relatively new find in the coal deposits of the Bukit Barisan (Barisan Mountain Range) on the western side of Sumatra.  This material is known as "black amber" due to its very dark color.  This material...

This material is variously called chalcedony, agate, or pastellite jasper. It comes from an area south of Burro Creek. Pale blue in white light, under SW it fluoresces green and white, while under LW it fluoresces a combination of greenish, blue, and cream. The white/c...

An incredibly bright SW combo, the dolomite fluoresces deep red and the calcite red-orange. Under LW, the dolomite continues to produce a faint red. 

SW lit by a 240w SW transilluminator. LW lit by a pair of 365nm flashlights. Specimen is 76 x 50 x 48mm. 

The Pugh Quarry is a large open pit limestone operation located near the town of Custar, in Wood County, northwest Ohio, and has been a notable source for well-formed and aesthetic, amber to golden colored calcite crystal specimens.  Less commonly, fluorite specimens h...

Fluorite is not a commonly occurring mineral species in the state of Wisconsin, but here's a rare example of the elusive Wisconsin fluorite. This specimen has an interesting story- it was found in the Sturgeon Bay area (Door County) during the excavation of a new parki...

Schalenblende is an interesting rock composed of concentric layers of fine grained sphalerite, typically included with intergrown crystals of other sulfide minerals such as wurtzite, galena, and pyrite.  In some specimens, the sphalerite is fluorescent under UV, displa...

These barite specimens, collected from an abandoned barite mine in Custer County, Colorado, show an unusual multi-wavelength red to orange fluorescent response under all UV wavelengths.  Most fluorescent barite responds to UV with pale white, blue/white, or cream/white...

The Cave-In-Rock area of Hardin County in southern Illinois is known for producing some of the most spectacular display quality fluorite specimens on the planet.  However, the fluorescent properties of this material can be hit or miss.  Some specimens show show little...

A large, well-formed, red/brown willemite crystal sits on top of a matrix of white calcite, from the Sterling Mine, Sterling Hill, Ogdensburg, New Jersey.  This specimen measures 86 x 76 x 48 mm, and weighs 405 grams.

The photograph above shows the fluorescent response...

Raspberry red colored, hexagonal crystals of corundum (var. ruby) in a granite-like matrix, from an unidentified mine in Mysore, India.  Under long wave UV the ruby crystals fluoresce an intense red color and the matrix shows a pale blue/white response.  The size of th...

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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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