



578 ISLE OF MAN. MINERAL VEINS. 



specimens assume at times a certain degree of trans- 

 parency. In the vicinity of Laxey I observed fragments 

 of white quartz stained irregularly with black ; the black 

 matter appearing to be uncrystallized tourmalin, since 

 crystals of this mineral were found shooting from it 

 through the quartz. 



In several places chlorite was found imbedded in small 

 cavities in the quartz, and, as is very common, entangled 

 in its substance. 



Talc also occurs in the quartz in several situations. 

 It is generally found in small scales, or in a more con- 

 tinuous form, in the rifts of that substance. In the 

 metallic vein of Laxey it may also be se^n in larger 

 concretions, consisting of minute particles aggregated in 

 pulverulent or scaly lumps, and of a pearly brilliancy. 



Mica is occasionally found in the quartz in similar 

 circumstances, being readily distinguishable from the 

 talc by the well known characters of both. A less 

 common variety of this mineral, of a bright gold colour 

 and of a highly metallic lustre, occurs also in the clay 

 slate, a rock with which it is rarely associated in a form 

 so conspicuous. It forms irregular lumps of no great 

 size, imbedded in the schist, and consisting of distinct 

 plates confusedly entangled together. 



A few metallic substances, independent of those enu- 

 merated in the description of the mines, have been 

 found in the island, bur two of them have notAgen traced 

 to their native places. 



Wolfram is the most conspicuous of these. This was 

 found in detached pieces, connected with quartz, in the 

 vicinity of Foxdale mine ; but the attempts which were 

 made to trace it to its source in the hill, did not 

 succeed. The specimens still preserved, are of con- 

 siderable magnitude. 



It is asserted that manganese has also been found, 

 but I was unable to procure any specimens. I have 

 no reason however to doubt the truth of the assertion. 



Hepatic iron ore occursim Laxey nwie, at Spanish 



