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Vibrating- sample magnetometer (VSM) is a magnetic measurement method to calculate the induction magnetization by observing magnetic moment (M) which is response of applying ascending and descending magnetic field (H) to the material. Initially from zero magnetic field, ascending magnetic field was applied until Hmax. Then the applied field was decayed to zero and switched polarity till approaches -Hmax (descending). The field was then ascended again until Hmax. The observed magnetic moments were plotted versus magnetic field so that they form a kind of loop called hysteresis loop. This paper introduces an approach to process hysteresis loop by creating MATLAB program. It is conducted by subtracting the magnetic moment between descending and ascending (Δm). Then, the first derivative and second derivative of Δm is applied. The behavior of these derivative curves can be used to evaluate type and domain of magnetic mineral.