WHITE COEPER-ORE. 121 It is brittle. It is easily frangible. It is heavy. Specific gravity, 4.500, La Metherie. Chemical Characters. Before the blowpipe, it yields a white arsenical vapour, and melts into a greyish-black slag. Constituent Parts. Henkel, who gave the first account of this ore, informs us, that it contains 40 parts of Copper, and the remain der consists of Iron, Arsenic, and Sulphur. Geognostic Situation. It occurs in veins and mineral beds in primitive and transition rocks. It is usually accompanied with copper - pyrites, and copper-glance or vitreous copper-ore, sel- domer with grey copper-ore, copper-green, red copper- ore, azure copper-ore, and native silver. Geographic Situation. Europe.—In the mine called Huel Gorland in Corn wall ; in the mines Lorenz Gegentrum and Elias, neai Preyberg in the Electorate of Saxony ; Rudelstadt, Al- tenberg, and Kupferberg in Silesia; Lauterberg in the Hartz; Prankenberg in Hessia; Christophsthal, near Preiidenstadt in Wurtemberg; Strazena, behind the Creutzberg in Upper Hungary. Asia.—Catharinenburg in Siberia. America.—Chili. Observations.