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Calculi  are   deposited  chemicals   in  compact  form . The    cause    of  calculus  formation  is  not  known ;  however   many  physical  factors    which  affect   the  metastable   solubility  or  insolubility  of  crystalloids  in    complex  biological fluids are involved in the phenomenon . The majority    of   kidney   stones   are   composed   of  one  or   more  of  the  following    substances : calcium oxalate , calcium phosphate , uric acid , cystine ,or    a mixture of these with magnesium ammonium phosphate. Most medical    therapy for renal stone disease is  now based  on analysis of  calculi ; and    decisions about proper procedures for  treatment  require  knowledge of    stone composition.          In this  study  267  renal calcuili were analysed.          The commonest types  of calculus  are  calcium  oxalate   95.9%  and    nonoxalated   calcium  97%  and  uric  acid  calculi  53.2%  or  mixture  of    the two.          Stone composition  is an important  guide  for the physicians decisions    concerning investigation and a rational choice of treatment .