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Ultraviolet Activators
Manganese (reds in calcite)
Titanium
Vanadium
Chromium (chromium oxide, red in ruby)
Copper
Silver
Tin
Antimony
Tungsten
Lead
Bismuth
Uranium/Salts (green in opalite and quartz's)
Germanium (orange in topaz)
Scandium
Yttrium (green in fluorites)
Lanthanum
Cerium
Praseodymium
Neodymium
Samarium
Europium (blue in fluorites)
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
Indium
Gallium
and others
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