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Table 5

Comparison between the MA (Armorican Massif), MC (Massif Central), Al (external massifs of the Alps), the number of analyses (No. of analyses) and the percentages (% MAA) of fibres whose representative points for their chemical composition are located in the “Magnesio-Actinolitic-Amphibole” range with respect to the totality of analyses for each massif.

Ratio WHO AM/MC WHO AM/Al >0.5 μm AM/MC >0.5 μm AM/Al
No. of analyses 20 6.9 20 6.9
%MAA 1.7 1.0 1.2 1

This is for fibres with WHO dimensions and fibres longer than 0.5 μm. For example, for fibres with WHO dimensions, there are 20 times more analyses done in the Armorican Massif than in the Massif Central, the percentage of MAA fibres (magnesio-actinolitic-amphibole) from the Armorican Massif is only 1.7 times greater than those of the Armorican Massif [sic]. Magnesio-actinolitic-amphibole.

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