KINDS OF ROCKS. 439 
In New Hampshire, at various places, but most prominently near Con- 
cord, a fine-grained whitisn granite. In Massachusetts at several 
points, especially in Gloucester at kockport, a red granite. (The Quincy 
“granite” is a syenyte.) In Rhode Island, at Westerly, a fine-grained 
whitish granite. In Connecticut, at Millstone Point near Niantic, and 
at Groton, near New London, a fine-grained whitish granite ; at Stoney 
Creek, a pale reddish, but liable to large micaceous spots ; at Ply- 
mouth, on the Naugatuck, a whitish granite, even and fine-grained 
more easily worked than the Westerly. 
2. Granulyte. (Leptinyte.)—Like granite, but containing 
no mica, or only traces. Metamorphic and eruptive. 
VARIETIES.—a. Common granulyte ; white and usually fine granu- 
- Jar, acommon rock in Western Connecticut and Westchester Co., New 
York. b. Mesh-colored ; usually coarsely crystalline, granular, and 
flesh-colored ; the coarse flesh-colored ‘‘ granite” of the Eastern or 
Front Range of the Rocky Mts., in Colorado, sometimes called A plite, 
_is partly of this kind ; it contains a little albite or oligoclase with the 
orthoclase. c. Garncetiferous. da. Hornblendic; containing a little 
hornblende—a variety that graduates into syenyte. e. Magnctitic ; 
containing disseminated grains of magnetite, a kind common in 
Archean regions, in the vicinity of the iron ore beds, cccurring in 
Orange Co., N. Y., and south in New Jersey, and also at Brewster’s, 
Dutchess Co., N. Y., and in Kent and Cornwall, Conn. f. Graphic 
(Pegmatyte); like gr. hic granite, but containing no mica. The 
coarser granulyte, especially that cf veins, is cften called pegmatyte 
when not graphic. 
_ 8. Gneiss.—Like granite, but with the mica and other 
ingredients more or less distinctly in layers. Gneiss breaks 
most readily in the direction of the mica layers, and hence 
its schistose structure; in consequence of this structure, 
many kinds may be got out in slabs. It often graduates 
imperceptibly into granite. Metamorphic. 
VARIETIES.—Similar to those under granite. a. Porphyritic. b. Al- 
bitic. c. Oligoclase-bearing. a. Hornblendic. e. Micacecus. £. Globu- 
lif rous. g. Epidotic. h. Garnetiferous. i. Andalusitic; contains an- 
dalusite in disseminated crystals. j. Cyanitic ; contains cyanite, a 
variety that has been observed on New York Island, and also in New- 
town, Ct., Bellows Falls and elsewhere in N. H. k. Graphitic ; con- 
tains graphite disseminated through it. 1. Quartzose; the quartz 
largely in excess. m. Quartzytic ; consists largely of quartz in grains, 
being intermediate between quartzyte and gneiss, a variety occurring 
just northeast of Bernardston, Mass. Fig. 3 on page 410 represents, 
natural size, a small piece of the porphyritic gneiss of Birmingham, 
Conn. 
Some gneiss is very little schistose, being in thick, heavy beds, 
granite-like, while other kinds, especially those containing much 
mica, are thin-bedded, and very schistose ; the latter graduate into 
mica schist. The so-called granite of Monson, Mass., is a granitoid 
gneiss. Its gneissoid structure facilitates greatly the quarrying. 
