✍ Scribed by P. Picot
No coin nor oath required. For personal study only.
L ~inventaire min~ralogique syst&matique des gftes min~raux fran~ais par d&partement, permet d'~tablir des eomparaisons r~gionales. Ces comparaisons peuvent porter sur la r&partition d'esp~ces min~rales pr~cises correspondant & un ~l~ment donn& et donc sur la r&partition de eet ~l~ment. Dans un premier stade, nous avons s~lectionn~ le bismuth, qui, sans &tre trop universel, pr&sente une aire de dissemination suffisamment vaste pour &tre significative. L'~tude de sa r~partition, & l'~chelle m~tropolitaine, permet de constater l'existence de trois axes bismuthif~res principaux, coincidant avec des alignements observes sur photo satellite.
Regional correlations between french ore deposits can be established with the help of a systematic mineralogical survey. Thereby the distribution of a chemical element expressed in different specific minerals is investigated. Bismuth was first selected, because its both wide and not too common occurrence makes it significant. As a result three main Bi-bearing axis were clearly defined on a county-wide scale which also showed obvious relationships with lineaments.
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