The aim of this work was to characterize chemical, mineralogical, granulometric, plastic and thermally three clays, named Cascajo (C), Roja (R) and Amarilla (A), proceeding from Barichara, Santander. As well as, to obtain ceramic pastes suitable for the manufacture of bricks and roofi ng tiles. For which ceramic test pieces were made by pressing, which were sintered to 1050oC and later them were physical and mechanically characterized. The results demonstrated that the paste of clay Roja, with water content between 24 and 38%, is the most adequate for the manufacture of roofi ng tiles; since the ceramics present low water absorption (8.2 %) and high rupture module (9.3 MPa). To obtain bricks it is recommended the paste with clays mixture of 55% Cascajo and 45% Amarilla, with water content between 23 and 32%; so, ceramics with water absorption minor to 15 % and rupture module bigger than 5 MPa are obtained.