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Pearls
6 different images of cultured pearls. Top to bottom:- .1. x-ray fluorescence reveals freshwater nucleus.2. Candling reveals banded freshwater mussel nucleus through thin nacre coating..3. Lauegram x-ray shows strncture of nucleus..4. Ordinary x-ray shows gap between nucleus and nacre..5. Microsection shows banded nucleus..6. Regular photograph.
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