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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)

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...

Hemimorphite is a zinc silicate hydrate mineral that is found in various locations worldwide.  Most hemimorphite specimens show little or no fluorescence under UV, but some will respond with colors of blue or green, usually under short wave UV (see related posts, below...

Named after its type locality, the Zuni mine in San Juan County, Colorado, zunyite is an uncommon aluminum sorosilicate mineral that shows a soft, cherry red fluorescent response under short wave UV.  The specimen shown here features hundreds of small fluorescent zunyi...

The Linwood Mine, an underground limestone mine in Buffalo, Scott County, Iowa, is known for producing beautiful display quality calcite and barite specimens.  This location has also produced some interesting fluorescent specimens as well.  This is one such piece.  It...

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...

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