PHYSIOGRAPHY. 255 



Variegated Copper. 



rough, particularly those of the cube, and often curved ; 

 much subject to tarnish. 



Lustre metallic. Color intermediate between copper- 

 red and pinchbeck-brown. Streak pale greyish-black, a 

 little shining. 



Rather sectile. Hardness=3-0. Sp. gr. = 5-003, from 

 the Bannat. 



Compound Varieties. Twin-crystals ; axis of revolu- 

 tion perpendicular, face of composition parallel to a face of 

 the octahedron, the individuals being continued beyond the 

 face of composition. Massive; composition granular, 

 strongly connected ; fracture conchoidal and uneven. 



1. Before the blow-pipe, on charcoal, it melts into a globule, which 

 becomes magnetic, if kept in the blast for some time. 



2. Analysis. 

 By PHILLIPS. 



Copper 61-07 



Sulphur . 23 ' 75 



Iron 14 ' 



Silica ' 50 



3. It occurs in beds and veins ; the crystallized varieties only in veins. 

 It is accompanied chiefly by various other ores of copper. 



4. It occurs at Orawitza and other places in the Bannat, associated 

 with Garnet. It is found likewise in beds in the cupriferous shale of the 

 Mansfeld, included in thin layers in the bituminous marl-slate. But it is 

 particularly found in Cornwall, in the vicinity of Redruth. In smaller 

 quantities, it is found in Ireland, Hessia, Silesia, Norway, Sweden, &c. 



It has only been met with in a few places in the United States. Thin 

 seams occur in granite, at Chesterfield, (Mass.), and in Pennsylvania, 

 where it occurs under circumstances similar to those mentioned at Mans- 

 field. 



VARVICITE. 



In radiating and twin-crystals. Cleavage prismatic. 

 Lustre sub-metallic. Color iron-black to steel-grey. Streak black. 

 Hardness (scale of BREITHAUPT) = 30... 3-75. Sp. gr. == 

 4-531, from Warwick ; = 4-623, from the Hartz. 



