Pure
This is Pure motives with respect to rational equivalence.
Scholl: Classical motives
Kuennemann: Chow motive of an abelian scheme (in Motives vol 1)
André: Une introduction aux motifs
3
Andrea Miller: Chow motives of universal families over some Shimura surfaces
http://mathoverflow.net/questions/75017/decomposition-of-motives-of-cellular-varieties
nLab page on Chow motives