Morphology and purity of crystalline particles of m-chloronitrobenzene (m-CNB) from a batch suspension crystallizer were experimentally examined for the m-CNB and o-CNB eutectic system, There are two types in product particles, agglomerates and non-agglomerates. The agglomerates are constituted by several elementary crystals whose sizes are almost equal to the number-based mean size of non-agglomerates, The purity of agglomerates is lower than non-agglomerates and decreases with increasing size. This is caused by entrainment of mother liquor in the bridges during agglomeration.