Isostructural with bobfergusonite of alluaudite SG; structure contains 6 octahedral M (= Mn, Fe, Mg, Al) sites & 5 X (= Na, Mn, Ca) sites with CN btw 6 & 8; 6 M octahedra share edges to form 2 types of kinked chains extending along [101] with 1 consisting of M1-M4-M5 & other M2-M3-M6; these chains are joined by PO4 tetrahedra to form sheets || to (010), which are linked together thru corner-sharing btw PO4 tetrahedra & MO6 octahedra in adjacent sheets, leaving open channels || to a, & large X cations are situated; zhanghuifenite diff from bobfergusonite; M4 & M5 sites in former are mainly occupied by Mg, but by Fe2+ & Fe3+, resp, in latter; other is that X2-X5 sites in zhanghuifenite are all nearly or fully occupied with Na, resulting in 3 Na apfu in ideal formula, but X4 & X5 are ½ occupied in bonfergusonite, giving rise to 2 Na apfu.