Tinguaite, Old Stock Flourescent specimen, Magnet Cove, Arkansas, ex Delinde

A bit about Tinguaite, from Mindat: "A variety of phonolite consisting of alkali feldspar, nepheline with or without other foids, aegerine and sometimes biotite. It is characterized by "tinguaitic texture" in which needles of aegirine occur interstitially in a mosaic of alkali feldspar and foids."

Henry took the extracted sample and cut/polished it to reveal its beautiful and unique interior.

When the specimen is exposed to Longwave UV light, a bright reddish orange flouresent mineral can be seen included in the sample. Other unknown hues can be seen as well. A Magnet Cove expert examined some of the other yellowish hues, and could not decipher what minerals they were. 

I believe this reddish orange though is Magnet Cove Hackmanite, which is said to deliver some very peculiar qualities!

Here is a snippet from American Mineralogist, from  JULY 01, 1941

"Two varieties of fluorescent sodalite are found in the tinguaite rocks of Magnet Cove, Arkansas: a blue sodalite that fluoresces a purplish-blue to violet-red, and a white variety, hackmanite, which strongly fluoresces a reddish-orange. The hackmanite also exhibits the peculiar phenomenon of evanescence; that is, change of color from rose to colorless and back again with alternate exposures to light and darkness. It shows also the property of photosensitivity; that is, the phenomenon of induced reappearance of the rose color by exposure to ultra-violet radiation and the disappearance of the color in daylight."