Iron oxide-supported chrysotile asbestos was prepared by hydrolysis of aqueous iron sulfate solutions in the cylindrical mesopores of 8 nm diameter. At most 20 % of the pore volume of the tubules was filled with iron compounds. The iron states in the products were examined by Mossbauer and X-ray absorption spectroscopy. Unexpected products, beta-FeOOH and ferrihydrite or amorphous hydrous iron oxide, were supported in the mesopores by hydrolysis of Fe(II) and Fe(III) ions, respectively, and showed high adsorptivity and magnetic-field-induced desorptivity for NO. Such formation of unexpected product is referred to a template effect of the nanotubules on the crystal growth.