Colorless and transparent BaCaBO3F single crystals were grown by employing the Kyropoulos method. A well-developed morphology of BaCaBO3F crystals is observed, but it differs depending on the growth direction. Differential scanning calorimetry analysis showed that BaCaBO3F crystal melts congruently at 1083.4 degrees C. The optical transmission spectrum of the BaCaBO3F crystal was measured at room temperature, and it was found to be transparent in the 220-2500 nm wavelength range. (c) 2005 Elsevier B.V. All rights reserved.