226 Miscellaneous Notices of Mineral Localities, fyc, 



the Hoosack and Green Mountains ; though no where else* 

 (as far as I recollect) constituting so large a mass. A variety 

 of quartz rock, in which the ingredients are arranged in dis- 

 tinct layers, the quartz, being greatly in excess, constitutes 

 strata of considerable extent, in Northfield, Vernon, Lever- 

 ett, &c. along Connecticut river. Quartz rock of a similar 

 character also constitutes a considerable part of the Blue 

 Ridge in North Carolina ; particularly the remarkable peak 

 called Pilot Mountain. I doubt not but our geologists, by a 

 little attention, might easily identify in our country all the 

 varieties of this rock, described by the author above named, 

 as existing in Europe. I ought perhaps to mention, that in 

 a former volume of this Journal, I described the conglome- 

 rate quartz rock, as occuring both on the eastern and the 

 western sides of the Hoosack Mountain. The variety of this 

 conglomerate described by Prof. Dewey, as " cemented by 

 fibrous brown hematite," and which the traveller not un- 

 frequently meets with in New Marlborough and the north 

 part of Canaan, is not mentioned by Macculloch and ap- 

 pears to be new. 



Scapolite Rock. 



In mineralogical treatises, scapolite is described as rather 

 a rare mineral ; but in this country it occurs in large quan- 

 tities, especially at Bolton and Boxborough in Massachusetts, 

 The locality in Canaan, however, exceeds in extent any 

 thing before heard of. From the space it there occupies, I 

 have no hesitation in denominating it a rock. About half a 

 mile north east of the meeting house, it forms regular strata, 

 at least two miles long, and from a quarter, to half a mile 

 wide. It is associated with granular limestone ; and on its 

 western limits, is intimately mixed with that rock. It is the 

 compact variety and has a splintery fracture. I noticed 

 three varieties of this rock. 

 1 . Compact scapolite. 



2. Compact scapolite and limestone. 



3. Compact scapolite and mica. 



This rock is distinctly stratified, the strata varying from a 

 few inches, to a foot or more, in thickness, and dipping to 

 the east, at an angle between 45° and 60°. These strata are 

 usually crossed, nearly at right angles, with another set of 

 seams, dividing the rock into columnar masses. The exter- 

 nal part of the rock is generally partially decomposed, to 



