Trace element compositions (Al, Si, Ca, Zr, Nb, V, Cr, Fe, Sn, W) have been analysed from accessory rutile from the tourmaline breccia of Wheal Remfry, SW England. The analyses show that rutile is the main carrier of Sn in the tourmaline breccia of Wheal Remfry. High Fe (Sn, W) in the final outer growth zones of rutile and tourmaline suggest open-system behavior during breccia formation, with an increasing contribution from relatively oxidizing formation waters. The tin, present as Sn
in the miniralising fluid, enters the structure of the rutile which coexists in intergrowths with tourmaline in the breccia matrix. The amount of Sn
in the fluid was probably too low for cassiterite to form as a separate phase.