Science and Education Publishing Turkish Journal of Analysis and Number Theory 2333-1232 4 3 2016 8 27 QK Classes in Clifford Analysis 82 86 EN M. A. Bakhit Department of Mathematics, Faculty of Science, Jazan University, Jazan, Saudi Arabia TJANT2016435 10.12691/tjant-4-3-5 2016 3 27 2016 7 30 2016 8 25 In this paper, we define the classes QK of quaternion-valued functions, then we characterize quaternion Bloch functions by quaternion QK functions in the unit ball of , Further, some important basic properties of these functions are also considered.