Rock is one of the abundant materials widely used in the construction of breakwaters. Their performance is directly related to the durability of rock and its physical characteristics. In this paper, the durability and physical characteristics of eleven samples of rock masses used in the rubble-mound breakwater of Anzali Port, Iran, were evaluated to determine their service life. Suitability. Nine of these are igneous and the remaining two were sedimentary rock types. Standard tests such as Los Angles abrasion test, modified aggregate impact value, and Slake durability index were performed. The samples were classified based on the criteria provided by the Transportation Research Institute (TRI) of Ministry of Road and Urban Development of Iran. This classification, uses physical, mechanical, and chemical parameters based on indices. TRI criteria put samples into classes; for igneous rocks from A, the highest quality, to D, the lowest quality, and for sedimentary rocks and A to E. Rock quality is determined based on the scores that each sample attained for each test. The sum of these scores provides the total score of the sample. The results showed that the class of rocks used in the breakwater had wide variation in scores for suitability. In addition, it was found that sedimentary rocks to have the best properties for water absorption and porosity

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