Natural etch pits in beryl related with the structure









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José Medina et al., « Natural etch pits in beryl related with the structure », Bulletin de Minéralogie, ID : 10.3406/bulmi.1983.7708


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Abstract En Fr

The etch pits in beryl crystals of diverse natural origin are studied in this work. The study was done on a beryl found in Minas Geraes (Brazil) which present inclusions and etch pits with a pseudopyramidal shape and hexagonal base. Small emerald crystals found in Muzo and Yacopi (Colombia) which show a great amount of corrosion were also studied. The technique employed in the initial stage was the observation through binocular and polarized light microscopy. Subsequently, we used a scanning electron microscope. We have established in this work a relationship between the various etch pits which appear on the basal, prismatic and pyramidal faces and the structural disposition of the atoms of the Al-O-Be chains on those surfaces.

On étudie les figures d'attaque sur des cristaux de béryl d'origine diverse. L'étude a été effectuée d'une part, sur un béryl de Minas Geraes (Brésil), qui présente des inclusions et des figures d'attaque de forme pseudohexagonale et à base hexagonale, et, d'autre part, sur de petits cristaux d'émeraude de Muzo et Yacopi (Colombie) qui présentent des marques importantes de corrosion. Dans un premier temps, la technique utilisée a été l'observation à la loupe binoculaire et au microscope en lumière polarisée, puis ultérieurement la microscopie électronique à balayage. Au cours de cette étude, on a établi une relation entre les diverses figures d'attaque apparaissant sur les faces basales, prismatiques et pyramidales et la disposition structurale des atomes des chaînes Al-O-Be sur ces surfaces.

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