Calcium hydroxyapatite (HA) whiskers and crystals were produced by the route of molten salt synthesis. The effects on whisker morphology of chosen flux, flux-to-HA ratio, synthesis temperature, and reaction time were investigated. The thermal stabilities of the produced whiskers were tested at 1300 degreesC in an air atmosphere. A tentative X-ray diffraction pattern was proposed for the HA whiskers, Molten salt synthesis with a K2SO4 flux was found to be a simple and sturdy technique for manufacturing short (less than or equal to 60 mum) HA whiskers in the temperature range from 1080 degrees to similar to 1200 degreesC. The alternative use of fluxes such as KCI, KBr, CaCl2, or Na2SO4, rather than K2SO4, over the temperature range 850 degrees -1000 degreesC resulted in the formation of large (similar to 25 mum) single crystals of HA.