Fluorite Pierre de l’étudiant/ Pierre du chercheur Histoire et traditions Cette pierre a rarement été trouvé dans les découvertes préhistoriques mais quand on la trouve c’est sous forme de fragments clivés, jamais brute, toujours façonnée. Un exemple en Belgique, la grotte de Chaleux a livrée près d’un demi-kilo de pierres dont neuf étaient des pierres …
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