Talc
Lo talc dit popularament pèira doça es un minerau compausat de silicat de magnèsi idratat de formula quimica Mg3Si4O10(OH)2. Es conegut dempuei l'Antiquitat mai foguèt descrich per lo premier còp en 1546 per Georgius Agricola. Es lo minerau qu'a la duretat pus febla amb una valor egala a 1 dins l'escala de Mohs. Es utilizat dins l'indústria farmaceutica, en medecina e per la produccion de pintura o de papièr.
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