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Magnetic susceptibility is a magnetic vulnerability that is often measured in rocks for various purposes. In this study, magnetic susceptibility was applied to distinguish weathering in rocks in different environments i.e. beaches and mountains. The rocks used are igneous rocks originating from Mount Sikambe and rocks on the coast of Prigi beach in Trenggalek Regency. The rock samples taken are rocks that have not undergone weathering, are half weathered and perfectly weathered rocks. The rock was crushed to form like a gravel, then tested magnetic susceptibility (χlf and χhf). The measurement results of rocks that have not decayed to perfect weathering in the mountain area of Sikambe show that the value of low frequency magnetic susceptibility (χlf) has a range of values (521.63-745.76)x 10-8 m3/kg, while in the coastal area Prigi has a range of values (4.65 - 7.72) x 10-8 m3/kg. From the values of χlf and χhf can be calculated the value of frequency dependent susceptibility (χfd). The average fd value in Gunung Sikambe is 0.2%, indicating that magnetic mineral grains are in the range of multi domains (MD) and on the coast of Prigi is about 6.06%, indicating that magnetic mineral grains are in the range of pseudo single domains (PSD) and single domain (SD).