MALLEABLE COPPER-GLANCE. 109 Third Subspecies. Malleable Copper-glance or Malleable Vitreous Copper-ore. Geschmeider Kupferglanz, Karsten. Id. Leonhard, Tabel. s. 57- Id. Haus. s. 72. Id. Karsten, Tabcl. s. G2. External Characters. Its colour is steel-grey. Internally it is strongly glimmering. The fracture is even. It becomes shining in the streak, and the colour is changed to lead-grey. It is malleable. Specific gravity, 5.099. Geographic Situation. It is a rare mineral, having been hitherto found only Li the mines of Catharinenburg in Siberia. Observations. Colour, lustre, fracture, and malleability, distinguish it from the Compact and Foliated subspecies; and its in ferior malleability distinguishes it from Siker-glance or Sulphureted Silver ore. S.' Variegated