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Excerpt from Dictionnaire Classique d'Histoire Naturelle, Vol. 15: Rua, S
Rubasse. Min. C'est le nom que l'on donne aux variétés de Quartz hyalin teintées artificiellement par l'introduction de dissolutions co 0 rées dans les fissures que l'on fait naître dans l'intérieur de leur masse en la chauffant jusqu'au rouge et la plongeant subitement dans un bain d'eau froide. (g. Del.)
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