88 silver. and the lustre is metallic. The varieties that verge on si ver glance have the most lustre; those that pass into plumose antimony the least. I he fracture is even, and fine-grained uneven. When ne-grained uneven, it is passing into brittle silver-glance • T ' "ill. delicate fibre,, it i, in durated antimony: Therefore, the fracture of the true white silver-ore is even. edgrf' ,h “ Sn,Cn ‘ S " e i '“ letermi ”* te »nd blunt- The streak is shining, and retains its colour. It is soft, approaching to very soft. It is slightly sectile. It is easily frangible. It is heavy. Specific gravity, 5.322. Chemical Characters. Before the blowpipe, it melts, and partly evaporates Ie.,,„g a bead of impure sil „ r , Constituent Parts. Dark White Silver-ore from Himmeisfiirst near Freyberg. Bead, . . 41 00 Silver, . . ^ Light White Silver-ore from Hinimelsfiint. 48.06 20.40 Antimony, 21.50 7.88 Iron, 1.75 2.25 Sulphur, 22.00 12.25 Alumina, - 1.00 7.00 (silica, 0.75 0.25 97.25 99.09 Klaproth, Beit. b. i. s. 175. Ibid. s. 172. Geognostic