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Messagerie francophoneOffretite - Mont Semiol - France
29th Nov 2007 17:18 UTCJean-Claude Lelievre
Je m'interoge sur la photo dans la galerie ID80919; je ne vois que phillipsite et montmorilionite. Je ne suis pas spécialiste des zéolites, mais j'aime beaucoup, et je n'ai pas la prétention de mettre en doute la determination de Volker Betz.
Ma question est motivée par un échange fait au 4M : Offretite de Tiezac (peut-être Thiezac), Cantal, France. Ce MM ressemble fort à de la Phillipsite, tout comme la photo 80919.
Merci de me faire part de vos commentaires.
Jean-Claude
29th Nov 2007 19:46 UTCVolker Betz 🌟 Expert
sorry but I cannot answer in french. The prismatic Xls in photo 80919 are Offretite, which occurs at Mont Semiol in different forms. The speciemn shown was collected by myself in 1983.
Phillipsite is diiferent.
Volker
30th Nov 2007 08:59 UTCEtienne Medard Expert
Quand elle est en cristaux isoles, l'offrettite a une section hexagonale, et souvent une face terminale plate (mais pas toujours). La phillipsite a une section rectangulaire, et se termine toujours par des faces "pyramidales". Au vu de la photo de Volker, je suis incapable de faire la moindre determination. Mais je lui fait confiance.
Est-ce que tu as une photo de l'echantillon de Thiezac? Je suis tres interesse par les zeolites du Massif-Central, et c'est un gisement que je ne connais pas (ou alors sous un autre nom).
Amicalement,
Etienne
medardetienne@hotmail.com
30th Nov 2007 15:22 UTCJean-Claude Lelievre
Je vous remercie de ces précieux renseignements.
Je n'ai aucune indication sur le gisement de Thiezac; il s'agit peut-être de travaux routiers...la commune se situe sur la N122, pas très loin du Lioran.
Jean-Claude
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