Converting quaternions to and from Clifford objects is not part of the
package but functionality and a short discussion is included in
Given a quaternion \mjeqna+bi+cj+dka+bi+cj+dk, one may identify \mjeqnii with \mjeqn-e_12-e_12, \mjeqnjj with \mjeqn-e_13-e_13, and \mjeqnkk with \mjeqn-e_23-e_23 (the constant term is of course \mjeqne_0e_0).
A different mapping, from the quaternions to \mjseqnCl(0,2) is
Robin K. S. Hankin
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