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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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Shortwave Fluorescent Minerals

Minerals that are fluorescent under SW UV (254nm)

(View all wavelengths on the main page)

This is a spectacular 4-color, mixed mineral, fluorescent specimen from the Franklin Mine, Franklin, New Jersey.  This rock contains sphalerite, chlorophane, apatite and willemite.  Depending on the UV wavelength of excitation, this piece shows a colorful variety of fl...

This is a variety of willemite from Franklin, New Jersey called "apple green willemite" for its, well...  apple green color.  This is one of the brightest fluorescing minerals when viewed under short wave UV, producing a brilliant green response.  It also shows a pheno...

This is a brightly fluorescent and phosphorescent rosette of flat, bladed, selenite crystals from Las Salinas de Otuma, Paracas, Pisco, Ica, Peru.  Collected from a large evaporative salt mine located 130 feet below sea level, near Otuma village, 16 miles south of Pisc...

This specimen of Mariposa calcite shows bright orange fluorescence under short wave UV on the underside of the base of the piece. Note the fluorescent zoning. This fluorescent response is typical for Mariposa calcite. This specimen is likely from either the Potosi Mine...

Mariposa calcite specimens are produced by several mines in the West Camp area of the Santa Eulalia Mining District in the Mexican State of Chihuahua.  This specimen is likely from either the Potosi Mine or the Buena Tierra Mine.  Mariposa, or butterfly calcite is uniq...

This brightly fluorescent specimen of calcozincite was collected during a 2019 night dig at Sterling Hill, New Jersey.  Calcozincite is a rock composed of zincite, calcite, willemite, hydrozincite and fibrous minerals such as tremolite, and is found in association with...

This is a manganoan calcite nodule on a goethite matrix, from a location not generally known for producing fluorescent minerals- the Montreal Mine, Montreal, Wisconsin. This multi-wavelength reactive specimen is intensely bright under mid wave UV, rivaling the brightes...

Aesthetic cluster of waxy, pale yellow, calcite scalenohedrons and minor chalcopyrite on a minimal limestone matrix, from the Sweetwater Mine, Ellington, Reynolds County, Missouri.  As shown in the photographs below, under UV, the calcite shows a beautiful multi-wavele...

This midwestern fluorescent beauty consists of pockets of scalenohedral calcite crystals on a limestone matrix, and was collected from the Pugh Quarry in Custar, Wood County, Ohio.  Under all UV wavelengths the calcite fluoresces bright blue/white.  The underlying lime...

Pabstite is a rare barium tin titanium silicate mineral that is only found in 4 known locations worldwide:  1.) Santa Cruz, California; 2.) Baja California, Mexico; 3.) Dara-i-Pioz Glacier, Tajikistan; and 4.) Muzeinyi Valley, Kyrgyzstan.  It is the tin analogue of the...

There is a widespread area that spans a region within America's Heartland between northwestern Nebraska to southwestern South Dakota that produces a unique and beautiful fluorescent material known as Watermelon Rock.  Watermelon rock consists of red/orange fluorescent...

This spectacular fluorescent specimen features multiple golden, twinned, calcite crystals on a matrix of dark purple, hydrocarbon-included fluorite, from the Denton Mine, Cave-In-Rock, Hardin County, Illinois. As seen in the composite photograph below, this specimen sh...

This is a lovely fluorescent specimen featuring numerous zircon crystals and minor fluorite in a non-fluorescent quartz matrix.  Collected from the Eureka Tunnel, St. Peters Dome, El Paso Co., Colorado.  The size of this piece is 54 x 45 x 25 mm.

Located in th...

This is an excellent example of Greenland Fantasy Rock, showing a beautiful multi-colored, multi-wavelength fluorescent response under various UV wavelengths. The term "Fantasy Rock" was coined by Greenland Mineral collector Mark Cole (and creator of the Nature's Rainb...

This beautiful multi-colored fluorescent specimen was surface collected from the tailings that remain at the site of the former Minerva No. 1 Mine, in Cave-In-Rock, Hardin County, Illinois.  This rock contains hydrocarbon-included fluorite, veins of calcite, and patche...

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