Needle-like hollandite-type K1.59Ga1.59Ti6.41O16 single crystals were obtained by the flux slow-cooling method. The average dimensions of a single crystal were a length of about 2 mm and a diameter of about 250 mu m. Structure refinement under a newly presented constraint condition was calculated by the JANA2006 program. The final reliability factors under an anisotropic constraint were R = 0.0153 and wR = 0.0481. (C) 2010 Elsevier B.V. All rights reserved.