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Gemstones, Minerals & Fossils
Gemstones and Minerals
fluorescent gemstones
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<blockquote data-quote="user 4386" data-source="post: 294101" data-attributes="member: 4386"><p>It is the problem with fluorescence - often the fluorescence is not caused by the elements that comprise the mineral, but by traces of other elements that it contains (eg in the sense that ruby and sapphire are corundum Al2O3, but what causes the fluorescence is the trace Cr that gives ruby its red colour (or Mn I think for blue sapphire). And of course precious opal doesn't have any colour at all (one is seeing refraction of light around the opal spheres as in a rainbow, as you probably know). I am not sure why so many fluoresce, and I wondered if it might be oil or something between the spheres - some are full of bacterial forms.</p></blockquote><p></p>
[QUOTE="user 4386, post: 294101, member: 4386"] It is the problem with fluorescence - often the fluorescence is not caused by the elements that comprise the mineral, but by traces of other elements that it contains (eg in the sense that ruby and sapphire are corundum Al2O3, but what causes the fluorescence is the trace Cr that gives ruby its red colour (or Mn I think for blue sapphire). And of course precious opal doesn't have any colour at all (one is seeing refraction of light around the opal spheres as in a rainbow, as you probably know). I am not sure why so many fluoresce, and I wondered if it might be oil or something between the spheres - some are full of bacterial forms. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
fluorescent gemstones
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