Quartz_clivé_de_Saint-Paul-la-Roche.jpg (613 × 407 pixels, file size: 57 KB, MIME type: image/jpeg)
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Description
Français : Quartz clivé de Saint-Paul-la-Roche (Dordogne). Ce quartz ultra pur a la propriété exceptionnelle d'être clivable. Les plans de clivage sont bien visibles sur la photo.

Certains voient en cette propriété une conséquence de l'impact météoritique de Rochechouart-Chassenon, d'autres expliquent son origine dans une cristallisation sous contraintes uni-directionnelles.

Le filon est malheureusement épuisé, sur-exploité dans les années 1970.

Auteur

Ce morceau de minéral a été trouvé par François Kraut qui l'a donné à son collègue François Permingeat. Il appartient maintenant à la collection du laboratoire de minéralogie de l'Observatoire Midi-Pyrénées à Toulouse. Photo de Guillaume Fleury (août 2006).
Date 27 August 2006 (original upload date)
Source Transferred from fr.wikipedia to Commons by Rudolf Pohl using CommonsHelper.
Author The original uploader was Geneamichaud at French Wikipedia.

Licensing

GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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The original description page was here. All following user names refer to fr.wikipedia.

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Date/TimeThumbnailDimensionsUserComment
current14:11, 16 August 2009Thumbnail for version as of 14:11, 16 August 2009613 × 407 (57 KB)File Upload Bot (Magnus Manske) {{BotMoveToCommons|fr.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{fr|Quartz clivé de fr:Saint-Paul-la-Roche (Dordogne). Ce quartz ult

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