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Bulletin 426 Plate XXIII B Bowlder outcrop coarse-grained granite.jpg
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Morganite, quartz, mica et tourmalines 3(Afghanistan).jpg
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Émeraude sur quartz (Brésil) 7.jpg
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Bulletin 426 Plate XXIII C Bared slope of granite gneiss.jpg
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Bulletin 426 Plate XV A Leopardite quartz porphyry.jpg
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