This work aims to characterize clay soil taken from Loudima, one of the localities in the department of Bouenza in Congo Brazzaville.X-ray diffraction, infrared spectroscopy, MEB, X-ray chemical analysis and mechanical tests were performed.The results obtained show that the Loud soil sample is a mixture of Kaolinite (41.33%), quartz (16.03%) and iron oxide (2.93%).By chemical analysis, we noted that the SiO 2 /Al 2 O 3 ratio = 2.16, which indicates that this soil contains a significant content of quartz.The MEB showed the presence of scattered clay leaves in the form of sticks and some aggregates.The technological tests carried out with this soil have a linear shrinkage of 3.1% at 1150˚C., an absorption rate of 6.1% at 1150˚C., a compression strength of 25.5 MPa at 1150˚C., and a flexural strength of 4.7 MPa at 1150˚ C.This gives the Loud sample the possibility to be used as a raw material for the manufacture of terracotta bricks.