STRONTIAN. 32 1 



primitive rocks, even in the farthest separated 

 countries. Hence also, a presumption arises, in 

 favour of the same descriptive system, with regard 

 to the accuracy of its other parts, as equally 

 founded on observation. And if the whole be 

 conformable to nature, a greater degree of regula- 

 rity will be acknowledged as existing in the for- 

 mations of the mineral kingdom on the great scale, 

 than some geologists have been willing to allow. 



The celebrated vein of lead-glance at Stron- 

 pan, is near the junction of the granite and 

 gneiss ; so that in some places, the wall on the one 

 side is said to be granite, and on the other gneiss. 

 But in general, the ore may be considered as oc- 

 curring in gneiss ; and is associated with iron 

 pyrites, cross-stone, calc spar, foliated zeolite 

 strontian, and heavy-spar. Of this vein, different 

 branches have been opened.— The mining com- 

 pany have a vein of copper-ore, on the opposite 

 side of Loch-Sunart, which they intend to work. 

 But I could not learn, in what rock it occurs. 



These few cursory remarks on Strontian and its 

 vicinity, which present one of the most interesting 

 fields of geognostic investigation to be found in 

 Scotland, I offer only as a mineralogical notice, 

 and as an imperfect answer to Professor Jame- 

 son's 39th query *. My time did not admit of 

 dwelling particularly on the examination. — -The 

 specimen shewn me by Colonel Imrie, of the trap 



Antea, p. 121. 



