172 "Dr. Bl-RGER on the physical Structure 



Buoys in the parish of Endellyon. All these workings are now- 

 given up.* 



Manganese has only lately been worked in Cornwall, and it ap- 

 pears to afford considerable profit to the proprietors of those mines* 

 The ore is shipped direct for Lancashire, where for some years it 

 has been employed in the bleaching of cotton. I was informed of 

 two mines of this metal, the one near the Indian Queen, on the road 

 from Bodmin to Truro, the other at St. INTary Magdalene, a mile 

 to the south of Launceston ; both are consequently situated in the 

 grauwacke formation. It is the pink siliciferous oxide of man- 

 ganese, which is worked at St. Mary Magdalene, the same variety: 

 that is found in the mines of Nagyag in Transilvania. I have already 

 given a detailed account of the mine of brown oxide of manganese 

 at Upton Pyne in Devonshire, accompanied with ferriferous car- 

 bonate of lime, &c. Dr, Maton, at the time of his last visit to 

 Exeter, was informed that the working of this last mine was 

 abandoned, and that others had been opened at Newton St. Gyres, 

 four miles N.W. of Exeter, f 



Manganese usually accompanies iron stone mines.:!: The soil at 

 Upton Pyne evidently contains a considerable quantity of iron ia 

 the state of red oxide j but whether it is found in the situations just 



* There exists a small deposit of grey antimony accompanied with quartz, in the 

 circle of Freyberg; it is considered as subordinate to an older deposit of antimoniatcd 

 sulphuret of silver. Nouvelle Theorie de la formation des filons, p. 303, 



According to Bergman, antimony is found in kidney-shaped masses, and in threads, 

 in veins of galena and hematites. It is also found native at Carlson, and in the mine of 

 Sala. Journal des Mines, No. xvi. p. 34. 



+ Observations on the Western Counties, vol. II. p. 74. 



+ Penzilly in Breage parish affords hematite of a liver brown colour, mixed with 

 Manganese. This fossil is found in a vein of yellow friable iron ore, through which it 

 runs in veins of different thickness and position. Klaproth's Miner. Obscr. p. 31. 



