The Fluorescence of Elemental Sulfur: Real or Perceived Phenomenon?
There was a post in the fluorescent mineral group about sulfur fluorescing a dull green under SW on a piece of calcite from Michigan, and a discussion about this being real fluorescence ensued. I have several pieces of similar material from Italy and had noticed what...
What is Tenebrescence?
In the early 1800's geologists noted that some specimens of sodalite from Greenland exhibited a bright pink color on freshly broken surfaces. This color rapidly faded ("bleached") upon exposure to bright light, reverting back to its original (natural?) color. Exposure...
How does light, heat, and time affect tenebrescence?
The following article is the summary of multiple conversations from the Fluorescent Minerals Facebook group, where people experimented with tenebrescent minerals and reported their observations. Tenebrescence is a reversible photochromic phenomenon in which a mineral...
A quatuor of fluorescent fluorites
Anyone with a basic fluorescent minerals collection has a blue-fluorescing fluorite, the most common color in fluorescent fluorites; many also have cream-white fluorescing fluorites (either the so-called "rootbeer" fluorite, or "non-rootbeer" amber colored ones like...
“Rainbow” assortment of longwave UV reactive minerals
As all experienced fluorescent minerals collectors know, shortwave UV is the wavelength under which there's the greatest variety of fluorescent colors in UV reactive minerals, and many either fluoresce only under shortwave, or are at their best under this wavelength....
UV Waves Vol. 56 Num. 1
Table of Contents QUANTUM STATES OF THE FMS by Philip S. Neuhoff 1–3 TREASURER'S REPORT CY 2025 by Andrew D. Silver 4 THE “CHILDREN’S” NEW CONDO by Conrad North 5–7 THE NEW FLUORESCENT MINERAL DISPLAY AT THE YALE PEABODY MUSEUM by Harold Moritz 8 ULTRAVIOLATION...
Blue Light Fluorescence – Who needs UV anyway?
Originally posted on Nature's Rainbows by Graham Fraser. We all are familiar with fluorescence caused by UV. But an ordinary blue light (blue LED) does a pretty good job when combined with some yellow glasses to block the blue and let through the other colors. A very...
DIY: Converting a Work Light into a Portable Short Wave Lamp
Originally posted on Nature's Rainbows by Michael Isaacson in 2015. Electrical work is dangerous. Do not attempt a project of this nature without a strong understanding of light fixtures, wiring, and electrical safety. I'm not sure how many people have built the 18...
Constante Mine, Santa Marta, Badajoz, Extremadura, Spain
Originally posted on Nature's Rainbows by Daniel C. Montero. Santa Marta is a new location for fluorescent minerals in Spain. It is also home to the Mugemisa geological and mining museum where you can visit its "Sala negra", the largest in Spain where fluorescent...
Fluorite and its different responses under UV light
Originally posted on Nature's Rainbows by Daniel C. Montero. The classic fluorescent mineral, but all fluorites are not luminescent under UV! Showing here some fluorites with different responses under long wave UV. Green visible Blue fluo from Gloria 1ª Mine, Córdoba,...