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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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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 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 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 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...

Terlingua calcite is a rock of many faces, as few other fluorescent minerals show such a varied fluorescent response under different UV wavelengths.  It is one of the most spectacular and beautiful fluorescent minerals due to its bright, multi-colored, multi-wave, fluo...

Lustrous root beer-colored fluorite cubes on a light grey limestone matrix, from the Stoneco White Rock Quarry, Clay Center, Ottawa Co., Ohio.  Fluorite specimens from Clay Center, Ohio, are notable for their bright white, zoned fluorescence under long wave UV.  Also i...

Had a great time at Tucson and found lots of new material. This was one of my favorite finds - Calcite crystals on fluorite crystals - shown LW, SW, and white light.  The calcite is very phosphorescent and offers a striking contrast to the bright blue fluorite.  This i...

On the typical yellow limestone matrix of this italian locality, there are several calcite cristals. Their color varies from white to honey and the dimensions are about 10mm.

Calcite fluoresces yellow, very bright at every UV wavelenght. In Sw some zones seem to tend to...

Approximately 30% of all diamonds show a fluorescent response under UV.  In most cases, the fluorescence is brightest under long wave (365nm).  The fluorescent response is activated by a complex interplay between various types of defects in the crystal structure of the...

Opal, Sepiolite.

Cerro de los Batallones, Torrejón de Velasco, Madrid, Spain.

The green fluorescence with an orange contrast due to clay deposits and also shows a central nucleus with sepiolite blue fluo that is very phosphorescent in long wave.

  In this area ten fossili...

Located in the Trigo Mountains of La Paz County, Arizona, the Red Cloud mine is a location famous for producing some of the best wulfenite specimens in the world.  Not generally known, however, the Red Cloud mine is also a prolific source of beautiful fluorescent miner...

Israel is not known for it's fluorescent rocks. Or really any rocks at all, as laws apparently prevent collecting samples to sell (with one, notable, non fluorescent exception).

On a recent business trip to Israel, I was determined to find something that fluoresced whi...

This exceptional two-color fluorescent specimen was collected by notable New Mexico collectors Ken and Gail Hennig from a new find in Socorro County, New Mexico.  This rock consists of blue/green fluorescent willemite and red fluorescent calcite with other non-fluoresc...

Acicular Aragonite "aka" Aragonito de Pantoja.

Deposit located in the municipality of Pantoja in Toledo. This municipality is approximately 50 km from Madrid, the capital of Spain.
The Aragonite of Pantoja is a calcium carbonate that crystallizes in the orthorhombic sys...

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Phosphorescent Minerals

Minerals that exhibit an afterglow when the UV light is removed

(View all wavelengths on the main page)