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  • Le mot tourmaline désigne un groupe de minéraux de la famille des silicates, sous-groupe des cyclosilicates, de formule chimique XG3Z6(BO3)3T6O18(OH,O)3(OH,F,O) où X = (Ca,Na,K,[]), G =(Mg,Li,Al,Mn,Fe2+,3+,V,Cr,Ti,Cu,[]), Z = (Al,Mg,Cr,V,Fe3+,Ti), T = (Si,Al,B,Be). La tourmaline cristallise dans le système cristallin trigonal à réseau rhomboédrique en baguettes ou aiguilles allongées à section triangulaire et faces courbes. (fr)
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