coos AND ESSEX DISTRICT, 'J'J 



doubt whether the veins which occur at Johanngeorgenstaclt arc concre- 

 tionary or igneous-fluid injections. "The general character of the lodes 

 is so like that of granite, that they might be considered to have been 

 injected in an igneous-fluid state; with which, however, do not agree 

 their slight breadth, and at times banded, even though not exactly sym- 

 metrical texture, as well as the irregular distribution of ores in them. 

 Since feldspar and mica may be formed in that way, a decision can only 

 be arrived at with great difficulty."* 



Dr. Hunt thinks it probable that "a great proportion of quartzo-fcld- 

 spathic veins are of aqueous origin, and have been deposited from solu- 

 tions in fissures of the strata, precisely like metalliferous lodes. This 

 applies especially to those granitic veins which include minerals containing 

 the rarer elements. Among these are boron, phosphorous, fluorine, lith- 

 ium, rubidium, glucinum, zirconium, caesium, tin, and columbium, which 

 characterize the mineral species, apatite, tourmaline, lepidolite, spodu- 

 mene, beryl, zircon, allanite, cassiterite, columbite, and many others."! 

 He thinks that these elements, which are found only in minute quantities 

 in the mass of the sedimentary deposits, have been eliminated from the 

 great mass, and have been accumulated here by deposition from water. 

 The argillaceous, wrinkled, corrugated schist in Pittsburg, Clarksville, 

 and Stewartstown is remarkably free from veins, and only those of quartz 

 are found, but these all seem to be of one type, and rarely ever more 

 than three or four inches in thickness, and very rarely do they contain 

 any metalliferous deposits. The veins often contain peculiar longitudinal 

 cavities, which give to it a fossiliferous appearance. Veinstones of this 

 character are common between Indian and Perry streams. The veins 

 are more numerous in the schist containing lime than elsewhere. The 

 more compact portions do not, as far as we have observed, contain veins 

 of any kind. In the green schist, where it contains veins, the quartz has 

 more or less of the mineral ripidolite, a species of chlorite, associated 

 with it. The whetstone grit rarely contains veins. The diorite rock, 

 extending from Colebrook through Stewartstown, Clarksville, and Pitts- 

 burg to Quebec province, has in a few places veins of quartz, though 

 they are nowhere very numerous, and often for a long distance it has 



* Von Cotta's Treatise on Ore Deposits, Prime's translation, p. 124. f Geology of Canada, p. 476. 



