326 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



well-known fine crystals associated with black and blue tourmaline, tripbylite, cryto- 

 lite, garnet, apatite, muscovite, and greenisli-wbite beryl, and the central sheet of 

 smoky white quartz received the terminations of the spodumene crystals, together 

 with a little beryl, moscovite, and cyrtolite.' 



II. DIKES IN GOSHEN. 



The first (like in Goshen, that on the Manning- farm, \rest of the Ash- 

 field road, near tlie north line of the town, can not be well stndied, as only 

 disconnected masses can be obtained and the l)oundaries of the dike are 

 not visible. 



The veinstone consists of a coarse aggregate of albite, indicolite, garnet, and 

 s])0(lumene, whose crowded and imperfectly outlined grains indicate a more rapid 

 crystallization than in the other localities. 



At the Barras vein, a mile to the west, the mass of the vein seems to be repre- 

 sented in place by a coarse aggregation of white quartz, orthoclase, and muscovite, 

 and occasionally greenish beryl, accompanied in places by a contiguous vein of red- 

 dishwhite quartz, while the scattered bowlders of albitic granite appear to be frag- 

 ments of a central band or secondary vein whose slow crystallization is suggested 

 by the beautiful aggregate of snow-white cleavelandite and grayish-white quartz 

 which forms the matrix of the rarer minerals. Of these the most abundant are the 

 spodumene, mostly in rectangular jjrismatic masses up to 18 inches in length, and 

 tourmaline in black, green, or blue-black (indicolite), generally massive, but sometimes 

 in good crystals. Less commonly were found beryl, green and white (gosheuite), iu 

 grains or sometimes fairly crystallized, with good terminations, garnet, rose-colored 

 muscovite, and, still more rarely, colurabite and cassiterite in minute crystals. Appar- 

 ently there has been also in parts of the vein a final deposition of masses of smoky 

 quarts enveloping smaller crystals of these minerals, but particularly of green beryl 

 and indicolite.- 



Here the secondary vein came in part in contact with the country rock, 

 and the latter, ^vhich is a whetstone-schist just at the contact, has been for 

 several inches (at least 4) fully impregnated with silica, albite, and tour- 

 maline in fine, black needles. 



Halfway lietween the Manning and the Barrus ledges, by the road- 

 side, south of J. B. Taylor's, much blasting- has been done recently (1889) 

 by Mr. Barrus for spodumene. It was proposed to export the mineral for the 

 manufacture of lithium. The spodumene is abundant in poorly bounded 

 crystals and coarse crystalline aggregates associated with little tourmaline, 



' A. A. Julieii, Spodumene and its alterations: Annals N. Y. Acad Sci., Vol. I, p. 351. 

 -A. A. Julien, ibid., p. 350. 



