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Aging-induced aggregation of the nanoparticles in the colloidal solution of indium hydroxide leads to the formation of micrometer particles in the form of well-shaped blocks. As shown by high-resolution transmission electron microscopy and selected area electron diffraction, the well-shaped blocks have a polycrystalline nature composed of small nanounits. After calcination at 400 °C, they consist of cubic and hexagonal In 2 O 3 . Semiconducting sensors, composed of well-shaped blocks of cubic and hexagonal In 2 O 3 , show high sensitivity to low levels of ozone in the air.