Nature's Rainbows | A Fluorescent Mineral SuperSite
Nature's Rainbows is a non-commercial Fluorescent Mineral SuperSite maintained entirely by volunteer hobbyists and contributors. The 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.
Margarosanite is a rare calcium lead silicate mineral that shows a beautiful short wave fluorescent response that ranges from blue/white to pastel shades of purple, pink and lavender. For these reasons it is one of the most coveted (and expensive) fluorescent minerals. First discovered in the Parker Shaft of the famous Franklin mine, in Franklin, Sussex County, New Jersey, this remains the classic location for the species. Margarosanite is also found at some of the mines in Filipstad, Värmland County, Sweden, such as Långban and Jakobsberg. The example featured here is from the type location, the Franklin mine, in Franklin, New Jersey.
This stunning specimen, seen above under short wave UV, features lavender to pink margarosanite, green willemite, red manganaxinite and tan-fluorescing prehnite.
Same specimen, seen under visible light. This piece measures 79 x 32 x 25 mm, and weighs 106 grams.
Reverse side of same specimen, showing fluorescence under short wave UV.
Reverse side of same specimen, shown under visible light.
Dumortierite is an aluminum iron borosilicate mineral that doesn't get much attention in the world of fluorescence, but is a lovely fluorescent species nonetheless. This fist-sized specimen features a thick layer of blue dumortierite on a matrix of white milky quartz, from the Vaca Morta (yes, dead cow) quarry in Serra da Vereda, Boquira, Bahia, Brazil. This specimen measures 10 x 9 x 5 cm, and weighs 475 grams.
Photo on left shows fluorescence under short wave UV (254nm). Visible light photo on right. Click on the above images for a larger view.
Zunyite is an uncommon aluminum sorosilicate mineral that shows a soft, cherry red fluorescent response under short wave UV. Zunyite gets its name from the type location that it was first discovered at- The Zuni mine in San Juan County, Colorado. The specimen shown here features hundreds of small fluorescent zunyite crystals in a matrix of mostly non-fluorescent quartz. This example is from a classic location for this material- the Big Bertha mine in La Paz County, Arizona.
Above: Small octahedral zunyite crystals show deep red fluorescence under short wave UV (254nm). There are also grains of a second, unidentified fluorescent mineral present, that shows a bright orange response.
Same specimen shown under visible light. Brown zunyite crystals in a matrix on light-colored quartz. The size of this specimen is 55 x 36 x 35 mm, and it weighs 73 grams.
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 impressive under short wave UV, the fluorite shows a cooler white, and slightly dimmer fluorescent response. This material is also phosphorescent under both wavelengths, showing a white glow after short wave UV, and green after long wave. The fluorescence in the Clay Center fluorites is likely due to the presence of an organic activator. The size of this specimen is 83 x 58 x 35 mm, and it weighs 166 grams.
The Clay Center quarry location has been closed to collecting for years, but fine specimens of this material can still be found in old collections and at shows.
The above photograph shows the specimen under visible light.
Fluorescence under long wave UV (365nm).
Close-up detail of the long wave UV response showing fluorescent zoning within the fluorite cubes.
Green phosphorescence following exposure to long wave UV.
Fluorescence under short wave UV (254nm).
Pale phosphorescent response following exposure to short wave UV.
Large plate of water-clear, honey-colored fluorite crystals on a light grey limestone matrix. From the May Stone and Sand Quarry in Ft. Wayne, Indiana. As seen in the photo below, the fluorite shows a beautiful pastel violet response under long wave UV. The limestone matrix is also fluorescent under UV. The size of this specimen is 15 x 10 x 6 cm, and it weighs 705 grams.
The above image was taken under long wave UV (365nm).
This is a fluorescent youngite specimen from Guernsey, Wyoming. Youngite is an agatized brecciated jasper with a coating of grayish translucent druzy quartz. Found in only one location, the youngite caves near Guernsey, Platte Co., Wyoming. The fluorescent response of youngite under UV is highly variable, with some specimens showing spectacular fluorescence, and others being only dimly fluorescent. This specimen is one of the brighter ones that I've seen. Under SW UV the drusy quartz fluoresces green, and the jasper center fluoresces a blue/grey color with deep blue phosphorescence. The long wave response is more subtle, with the jasper responding a brighter cream/brown and the quartz druse fluorescing darker olive green. The size of this specimen is 12 x 9 x 7 cm, and it weighs 847 grams.
The Youngite caves are located on private property, and have been off-limits to collectors for years.
This speciimen appears to have been trimmed to remove material for lapidary work. This actually has created a very sculptural and aesthetic looking piece. Seen in the above photo under (L to R) visible light, short wave UV (365nm), and long wave UV (365nm).
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 in all wavelengths. The piece below is about 2 inches by an inch and a half, is shown in LW, SW, MW and natural, and is from Hundholmen, Tysfjord, Norway.
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 is apparently a new discovery out of China.
Three red fluorescent calcities from Sardinia, Italy.
- The first one is a very beautiful specimen in daylight too.
Quartz and galena crystals are among the red fluorescent calcite “pine cones”. Calcite fluoresces saturated orange-red under Sw.
Size: 11 x 8 x 5.5 cm / Weight: 480g
- The second specimen best fluoresces in Lw and resembles the Boccheggiano aragonite for its saturated red color under uv and the green shade in daylight. Under Sw uv light, calcite is red/pink and other small areas fluoresces blue and pale yellow.
Size: 9 x 5 x 4 cm / Weight: 168g
-The last one calcite has variable size dogtooth white cristals on a quartz matrix. The biggest one measure about 32mm. It fluoresces in Sw Uv.
Size: 8 x 8 x 5.5 cm / Weight: 238g.
First specimen. Macro gif animation from daylight to Sw-Uv. Size of the frame. about 30mm
First specimen. Photoshop composition of daylight, Sw and macro
Second specimen. Gif animation: daylight - Lw - Sw
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 green
It’s phosphorescent too (green).
The origin locality is more famous for the black quartz...type it on google....
Dimensions: 6,5 x 3,5 x 3,5 cm
Weight: 337 g
Origin: Monteriggioni, Siena Province, Tuscany, Italy
Su una matrice calcarea gialla, tipica di questa zona della Toscana, si trovano ammassati cristalli di calcite dal colore variabile da bianco a mielato di dimensioni che raggiungono e superano i 10mm. Tra la calcite e la matrice calcarea si trova un sottile strato nero metallico lucente. La calcite è fluorescente giallo-crema, molto brillante, a tutte le lunghezze d’onda UV; in Sw forse la tonalità vira verso il verde...