448 J. D. Dana—Sand and Kaolin from Quartzyte 
Pinacoids: «Px, «Px, OP. 
Prisms: oo P3, «Pi, « P2, «Pie, oP, «P2. 
Clinodomes: P&x , 2P=. 
Hemidomes: $§P«,6Pa,4Pa%,2Pa,Px, —Pé&. 
Homipyramids: P, 2P, —P, —3P, —42P, 2P9, 3P}, 4P2, 3P3, 2P2, 3P3, 
—3P3, 3P3, 4P4, —3P3. 
Arr. LVI.—On the Decay of Quartzyte, and the formation of 
sand, kaolin and crystallized quartz ; by James D. Dana. 
Facts from the quartzyte regions of Massachusetts, Connecticut 
and Vermont fully sustain the observations of Mr. O. A. Derby on 
throws light published in this volume (page 203), a appear to 
quartzyte has cer been known, and for many years the product 
(obtained mostly from crushing the friable rock) has been used 
for making glass. The most extensive localities and those earliest 
worked are in the town of Cheshire, a few miles north of Pitts- 
field, as mentioned in Professor Hitchcock’s Geological Reports 
of 1832 and 1842, The sand-works are situated just west of the 
Js Mets oe also one mile and two miles south of te: and two 
miles to the stward, tne the borders of the tow of Savoy. 
I have found it gd to rely on the present position of the 
layers for evidence to the a position, the weakened beds 
tending to slip out oft place b ity. 
I have visited also a locality, “inal x worked, in the town of 
Savoy, about six miles east of the village of "Cheshire ; and 
another four and one-half miles east of Dewey’s station (Housa- 
h 
other Batiiion. 
