Milled antimony is a dark grey powder of 200+ mesh, but generally Sb can be bought as heavy, large size silver crystals that look and feel like pyrite. The powder is used for white fires (in lances etc.), to assure ignition (with Al) and as an important ingredient in glitter compositions although they do not necessarily employ antimony. Moreover antimony can be used to harden lead (employed e.g. for casting ball-mill media).