The natural materials and industrial residues concerned by the obligation of radiological characterisation mentioned in article R. 1333-39 are :
1° Natural materials :
a) Alum shales ;
b) Building materials or additives of natural magmatic origin, such as :
i) Granitoids, such as granite, syenite and orthogneiss ;
ii) Porphyry ;
iii) Tuff
iv) Pozzolan ;
v) Lava;
2° Materials containing residues from industries processing naturally radioactive materials, such as :
a) Fly ash ;
b) Phosphogypsum ;
c) Phosphoric slag ;
d) Residues from the primary production of metals (slag, slag, etc.).