Schist

Generic designation given to metamorphic rocks with a foliated texture, whose minerals, lamellar or acicular, are visible to the naked eye and arranged with the same orientation, thanks to the directed pressure under which they are formed, which gives the rock an appearance typical veneer. mineral rich in macro and micronutrients whose chemical elements are used in the elaboration of several important by-products for plant nutrition and plant protection, especially against pests and diseases and which can be used in agroecological production.