36 GEOLOGY OF OLD HAMPSHIEE COUNTY, MASS. 



(010) a great number of sheets of fluid pores with moving bubbles appear, 

 aiTanged part j^arallel to P (001) and part parallel to oo P (110). 



Microeline is abundant, with microperthitic structure. 



A plagioclase near albite occurs. 



The biotite is deep red-brown. 



Muscovite appears abundantly, in microscopic scales. 



Titanite is very abundant in congeries of grains, in one or two cases 

 inclosing a grain of raenaccanite. 



Zircon appears in regular square prisms P (111) co P (110), colorless. 



3. Granitoid gneiss, Becket. The best quarry stone of the Chester 

 Granite Company. 



Of slightly coarser grain than the best stone at the Clark Hill quarry, 

 and of clear gray color — a mixscovite-biotite-gneiss. The lens shows larger 

 limpid grains in a porphyritic granular groundmass, which contains all the 

 biotite and is somewhat dusty. 



The larger grains ai-e mostly quartz, without rutile needles, and with 

 minute fluid inclusions showing motionless bubbles of elongate shapes. 



Orthoclase occurs in rare, large grains, much dusted. 



Microeline is in secondary growths cementing a great number of grains 

 together. It is very fresh. 



Plagioclase is rather rare. 



The biotite is deep greenish-brown. 



Titanite is visible with a lens, but is present in only small quantity 

 in the slide. 



No zircon or magnetite occurs. 



CRUSHING TESTS. 



Prof. J. F. Kemp has given' some valuable facts in regard to the 

 granite quarried by the Hudson and Chester Granite Company at Becket, 

 Massachusetts. He says: 



"An analysis, which is the mean of two closely agreeing duplicates, was 

 made by Prof. L. M. Dennis, of Cornell University, and the soda is given 

 by difference, because in the NH^Cl and CaCOa used in the determination 

 of the alkalies some sodium was shown by the spectroscope. 



' Trans. New York Acad. Sei., Vol. XI, p. 4. 



