Halides

http://www.mindat.org/min-1576.html

Fluorite octahedral cleavages, Cave-in-Rock, Cave-in-Rock Sub-District, Illinois - Kentucky Fluorspar District, Hardin Co., Illinois, USA (http://www.mindat.org/loc-3753.html)
Activator blue fluorescence: Eu2+ partially replacing Ca2+
Activator golden yellow fluorescence: inclusions of droplets of brine from which the fluorite grew. Possibly with some contribution of organic matter.

http://www.mindat.org/min-1576.html

Fluorite: Hammam-Zriba Mine, Zriba-Village, Zaghouan Governorate, Tunisia (http://www.mindat.org/loc-26782.html)
Activator light blue fluorescence: organic material.

http://www.mindat.org/min-1576.html

Fluorite:Seilles, Andenne, Namur Province, Belgium (http://www.mindat.org/loc-314.html)
Activator blue fluorescence: Eu²⁺ replacing Ca²⁺
Activator red fluorescence: M-center (2F+Na⁺)
Specimens from collection of the KBIN in Brussels

http://www.mindat.org/min-1576.html

Fluorite: Frazer's Hush Mine, Rookhope District, Weardale, North Pennines, Co. Durham, England, UK (http://www.mindat.org/loc-1411.html)
Activator blue fluorescence fluorite: Eu²⁺ replacing Ca²⁺
Activator red fluorescence calcite: not yet investigated, probably Mn²⁺ and Pb²⁺

http://www.mindat.org/min-1804.html

Halite: Fulda, Hessen, Germany
Activator red fluorescence: Mn²⁺ replacing Na⁺ with Pb²⁺as a co-activator.

http://www.mindat.org/min-1804.html

Halite: Wintershall Potash Works, Heringen, Werra valley, Hessen, Germany (http://www.mindat.org/loc-1829.html)
Activator red fluorescence: Mn²⁺ replacing Na⁺ with Pb²⁺as a co-activator.

http://www.mindat.org/min-1804.html

Halite: Rudna Mine, Lubin District, Legnica, Lower Silesia, Poland (http://www.mindat.org/loc-21360.html)
Activator red fluorescence: Mn²⁺ replacing Na⁺ with Pb²⁺as a co-activator.

long wave UV

Long wave UV + midrange UV

Short wave UV

http://www.mindat.org/min-4181.html

Villiaumiet: Aris Quarries, Aris, Windhoek District, Khomas Region, Namibia (http://www.mindat.org/loc-7687.html)
Activator orange fluorescence: Intrinsic: M-centers (M-center = 2 F-centers + M⁺ (Na⁺, H⁺ etc.))

Monitor
this page

long wave UV

Short wave UV

https://www.mindat.org/min-4371.html

Fluorite var.: Yttrofluorite: (https://www.mindat.org/loc-192692.html)
The fluorescence is caused by rare earth elements that partially replace calcium. Yttrium itself does not partake in this fluorescence, but it is the 'main contaminant'. Check out the spectrum for more information about this fluorescence.

White light long wave UV short wave UV

Fluorite octahedral cleavages

Fluorite

Halite

Villiaumiet

Fluorite var. Yttrofluorite

Creedite

White light and Midrange UV resp.

Creedite:

Navidad Mine?, Abasolo, Rodeo, Mun. de Rodeo, Durango, Mexico

Creedite is not generally known for its fluorescence. It doensn't fluoresce consistently and when it does, it's not always for the same reason. Specimens from La Paz, Bolivia, in my collection fluoresce a lot like calcite and gypsum: light blue-green. This is usually caused by some organic matter, mostly humic acids. This creedite specimen from Durango fluoresces a clear violet-blue, clearly different from the blue-green fluorescence of the Bolivian specimen. Both specimens have a distinct greenish phosphorescence, which is a clear indication that they both contain polycyclic aromatic hydrocarbons (humic acids). It appears that the Mexican specimen also contains some gadolinium, cerium and europium that account for a violet-blue fluorescence. In this specimen, the ratio between the violet-blue and the bleu-green fluorescence sways towards the violet blue, but both are present. Go see the spectrum for more details.

Creedite

Het heuvelachtige land van Qinglong Co. (Photo Sunny Luo)

Talrijke grotten en holten in de bodem... (Photo Sunny Luo)

Weelderige begroeiing levert humuszuren op (Photo Sunny Luo)

Bruine verkleuring wijst op ingesloten organisch materiaal

Creediet vormt perfecte kristallen die in groepjes groeien

Vaak resulterend in bolvormige aggregaatjes

met een sterke fluorescentie, blauw tot blauwgroen. Typisch voor organisch materiaal

Zelfde specimen onder 365 nm LW UV. Fluorescenite in drie kleuren.

De letters A,B en C markeren de plaatsen waar het spectrum werd gemeten.

Creedite can apparently fluoresce due to more than one activator. However, specimens from China manage to pleasantly surprise us. They are found in the hilly area of Qinglong County, where locals look for them in the abundant caves and hollows. The lush vegetation and porous soil make it easy to incorporate humic acids and other organic plant residues into the creedite crystals (see photos).

Some crystal groups are therefore colored brown and fluoresce strongly blue-green under UV. I received a number of specimens from my e-friend Hercule Shen, which show very different fluorescence colors. One of them shows no less than three different colors in long wave UV, 365 nm.
1) White : The spectrum shows peaks of organic fluorescence/phosphorescence around 450 nm. A strong peak around 490 nm could indicate the presence of titanium as [TiO₆]^8-. No analyses have been carried out to confirm this, but ilmenite(Fe²⁺TiO₃) is found in the site, which makes the presence of titanium in creedite plausible.
2) Blue : an emission peak around 410 nm seems to point to the presence of trivalent cerium. The peak has been somewhat widened by the underlying emissions of the organic matter. Here too we see a peak of [TiO₆]^8- but this peak has also widened and shifted a bit, probably due to the presence of divalent europium that likes to fluoresce in that wavelength range.
3) Pink : around 570 nm we see a fairly sharp peak that is most likely caused by divalent manganese that replaces some calcium. Here, too, the emission of titanium is prominent. This reduces the saturation of the red Mn²⁺emission to a pale pink.
So you see, creedite is a real chameleon when it comes to fluorescence.

Qinglong County, Qianxinan, Guizhou, China