PHYSIOGRAPHY. 155 



Red Antimony Red Copper-Ore. 



3. Analysis. 

 By KLAPROTH. By ROSE, 



from Braunsdorf. 



Antimony . 67-50 . . . 74-45 



Oxygen . 10-80 . . . 4-27 



Sulphur . 19-70 . . . 20-47 



4. It is almost always accompanied by Grey Antimony, which has led 

 to the opinion among some mineralogists, that it owes its origin to the 

 decomposition of that species. It occurs in veins. 



5. It is found at Braunsdorf near Freiberg in Saxony, at Malazka near 

 Posing in Hungary, and at Allemont in Dauphiny in France. The 

 Tinder-Ore occurs at Clausthal and Andreasberg in the Hartz. 



RED COPPER-ORE. Octahedral Eruthrone- 

 Ore. 



Primary form. Regular octahedron. 



Secondary forms. 



i. 2. 



Octahedron, with edges truncated. Rhombic dodecahedron. 



3. 4. 



Rhombic dodecahedron, with Octahedron, with an- 



acute solid angles truncated. gles truncated. 



5. 6. 



Cube. Cube, with edges truncated. 



7. 

 Cube, with edges and angles truncated. 



8. 



Cube, with edges truncated, and angles re- 

 placed by three planes, inclining to 

 the faces of the cube, the angle 

 of the acumination be- 

 ing truncated. 



9. 10. 



Octahedron, with the Octahedron, with the angles repla- 



edges bevelled. ced by four plances resting on 



the primary planes. 



