MINERALOGY, _ 365 



son's visit that the copper-ore was mudi noticed. Th(y Mineralogy of 

 iron-ores here found, are, Shciland. 



1 . Dark-brow.n, fibrous, ajud mamiliatcd hjemalites ; 



% Columnar bog-iron ore ; 



3. Micaceous iron-ore ; 



4. Iron-ochre of a brown colour; 



5. StalacUtic iron-ore, colour dark brown ; 



6. ;^rthy matter, much charged with iron, spemingljj 

 arising from the debris of other ores. 



The copper-or^s are, 



1. Friable and amorphous carbonate of copper, co- 

 lour rich green.; 



^. Beautiful carbonate, of an emerald green, crystal- 

 lized in capillary' fibres of a silky lustre, diverging in 

 radii, from the centre. This species is found imbedded iu 

 iron-ore. 



3. Sulphuret of copper, disseminated through felspar 

 in some places, and, in others, in great masses in iron- 

 ore. 



The riph carbonates were found near the bottom of the^ ■ / 

 mine. The levels and shafts of j;hje old company seem to 

 have passed within three or four feet of this rich vein, 

 but never to have touched it. I walked through the gal- 

 leries scooped out in former attempts for about forty 

 fathoms, but saw only little appearance of copper ores, 

 while there was iron in abundance all around. The , ^ 



roads near the mine were all paved with fine iron haema- 

 tites, which the Cornish miners who were there did not 

 seem to regard as. of any value, nor indeed almost to 

 know. Some of them imagined it was a new kind of 

 copper-ore. Some pieces of bog iron-ore I had col- 

 lected, were^alled copper-spiwie by one of them ; hence, 

 it is evident, we cannot trust much to the mineralogical 

 opinions of the generality of miners. From the saline 

 taste of the waters of the mine, and-the crust of copper it 

 left on my knife, I proposed to the workmen to try i(^ 

 procure copper of cemeiitation in the usual way. This 

 company had already expended between £QOQO and 

 ^10,000 on the work, and had shipped one or two car- 

 goes of ore; for, when dressed and washed, it was tar- 

 ried to Jing^land to be smelted. I was informed, that the 

 * Vol. XV. — Supplemekt. Dod best. 



