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lumière naturelle /
daylight
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La fluorescence jaune-vert à vert est due
à la présence d'une petite
quantité d'Uranium.
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Common Opal : the yellow-green to green
fluorescence is due to the small amount of uranium found in
it. In daylight, this specimen is pale green and ochre yellow.
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OPALE commune, Californie,
États-Unis
L 7 x H 4,5 cm
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UV longs / long-wave
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©
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