Mineralogische Kring Antwerpen:
Stapel van Stenen:
http://www.stapelvanstenen.nl/
Museums with geological collections:
http://www.geologischmuseum.nl/
Fluorescense / minerals:
https://www.westerwolde.rocks/
http://www.naturesrainbows.com
http://uvminerals.org/fms/about-fluorescent-mineral-society
http://www.polmanminerals.com/
Light sources: