Email comments or suggestions:

Home

RSS Feed
  • reddit
  • Facebook Social Icon

Subscribe to our RSS (Real Simple Syndication) feed to get new posts delivered directly to your desktop!

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.


Feel free to contact us with comments and suggestions.

Like us on Facebook!

Midwave Fluorescent Minerals

Minerals that are fluorescent under MW UV (302nm/312nm)
 (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...

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...

A beautiful fluorescent calcite from the Viburnum Trend in southeastern Missouri. This large single crystal (~4 Inches long) on matrix is from the West Fork Mine, Reynolds Co., Missouri. The calcite only responds under mid wave UV and shows little to no fluorescence un...

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...

Plate of scalenohedral calcite crystals showing an unusual purple/blue fluorescent response under mid wave UV (302 nm).  This specimen is from an uncommon midwestern location; the Valders Quarry, in Valders, Manitowoc County, Wisconsin.  The size of this piece is 89 x...

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 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...

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...

Yttrofluorite is defined as fluorite (CaF2), where the rare earth element yttrium replaces some of the calcium atoms, and therefore has the molecular formula (Ca,Y)F2. Regardless of the science, yttrofluorite is a subtle, and truly stunning fluorescent mineral glowing...

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...

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...

Older Posts >

Please reload