Roofing Slate of the World, Part IV

Victor Cardenes has been working on a poster summarizing the main roofing slate outcrops in the World.

It compiles the location of the outcrops together with a new classification of roofing slates taking into account the color and the petrology.

For example, the lithotype B1 corresponds to the black-grey metamorphic slates, the most common type, while R1 would correspond to also metamorphic slates but with purple-red colors.

Source : Victor Cardenes – roofingslate.wordpress.com – November 2015