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Fig. 4


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Field pictures of fractures in the Fontainebleau quartzite. Upper line: raw pictures. Lower line: highlight of the fractures (dark grey) in the quartzite (light grey). A, B, C: typical geometry of the joints at metric scale. D, E, F: orthogonal joint network forming regular dihedrons seen from above (D) or along the working face (E,F). G: geometrical relationship between both joint sets (top view). It has not been possible to characterize systematic or non-systematic joints. A, B, D: Chamarande quarry, site 6. C, E, G: Madagascar quarry, site 1. F: Bois Persan quarry, site 5. Location Figure 1, Table 1.

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