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J. D. Dana—Sand and Kaolin from Quartzyte. 449 
2. Kaolin from quartzyte.—At the Cheshire sand-works, south 
of the village, the waters that flow from the quarries, or stand in 
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friable rock is well exposed at the quarry two miles south in 
bluff front, =i Takis en its layers here and there occur thin seams 
y Dr. A. A. 
Hayes, of Boston, afforded 75 per cent of silica to 25 of alumina, 
equivalent to a half-and-half mixture of kaolin and quartz sand. 
Similar facts were observed at the works a mile south of Cheshire. 
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sometimes has the layers alternating with seams of soft kaolinized 
feldspar; and occasionally this material is so mixed with the 
quartzyte as not to be easily recognized, except that the pacar 
quartzyte is a little coherent. 
Many kaolin beds of western New England occur in quartzyte 
areas. This is true of the largest of these deposits, that in the 
southwest corner of New Marlborough near the Canaan (Conn.) 
boundary ; the kaolin is sandy and contains fragments of quartzyte ; 
it has bedding from short transportation. It is true also of that 
of northeastern Sharon, where the kaolin contains much sand an 
its working brought to pe surface the friable quartzyte; also 
of as val deposit just e of Monument Mountain, between 
on, Vermont, has iar. to the eastward as the nearest 
otteropritie rock, and far the larger part of the clay is white, 
and thus pure from iron oxide. That of Monkton, Vermont, also 
a large deposit, is - a sandstone es independent, says ’Pro- 
faesot Hitchcock in the Vermout Rep ort (1861), of any limonite 
ed. That of Pownal, described es Dr. C. Dewey (this Jour- 
nal, xii, 298, a and kee of by Professor E. ets sas “a 
large bed of porcelain clay,” is also in a region of q 
3. Fel ldspathie quartzyte. ” source of the kaolin, Feldepesian 
quartzyte occurs near the li etween Lenox and Washington, in 
the latter own, two saileg ea vo of Dewey’s railroad station and 
four and one-half miles south- by-east from Pittsfield.* Large 
blocks, ev idently derived from a bed in the piempeale er! rete ten 
of the reg gion, and cavernous from the remo of 
the feldspar, lie over the ficld; the narrow ragge “a perce are 
often an inch or more long. Dr. ©. Dewey, who describes the 
* The locality is ‘seag xd the house of A. Dexter (situated near the junction 
tween the road from Dewey’s to Washington and another short road going 
north, one-half mile west ie the school-house corner), in the field south of the road. 
