The porous structure, acidic and magnetic properties of granular sorbents produced from natural aluminosilicates have been investigated. The adsorption capacity of sorbents in a process of transformer's oil refining (percolation method) was compared revealing an effective performance of a sorbent with magnetic domains. Granular sorbents with magnetic domains and with a value of saturation magnetization 1.7–2.3 (σ·10^-7 Tm³/kg, determined using the Faraday's method in 293 K) were prepared from halloysitic basalt weathering products, containing approx. 20 % of iron compounds. The produced halloysite sorbents, with a size of grains ranging 0.5–1.5 mm, possessed high mechanical strength and reveal adsorption properties which make them suitable for application in the refining percolation process of products of petrochemical or carbochemical origin.