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BRGM, Composition, fine, very fine and asbestiform amphibole fibres observed, shown in the diagram (S iapfu vs Mg/Mg+Fe2+) with the IMA 12 differentiation and dotted line for the proposed differentiation specific to the asbestos problem. The uncertainty calculated on (Mg/Mg+Fe2+) is negligible, on S iapfu it is 0.3%.
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