J. D. Dana—Sand and Kaolin from Quartzyte. 451 
another, three miles west of New Miford, which the same author 
light-colored muscovite and damourite usually three to six per cent 
while the quartzyte has almost none and the little oxide that is 
made is readily removed by percolating waters. No beds of 
white kaolin of workable value occur with the limonite deposits 
of western New England which I have examined, although clays 
abound in th 
pieces through the quartzyte. 
4, Pseudo-breccia from Quartzyte, and in some of this pseudo- 
breccia crystallized quartz—A very common source of the de- 
struction of quartzyte is the oxidation of its pyrite, as is well 
known—a mineral that is often present yet in general very spar- 
ay 
ferruginous cement; and Dr. Dewey in 1824 (this Journal, viii, 
18), and Professor Hitchcock in his Report of 1841 (p. 588), so 
ck has : 
limonite coloring the rock alongside of the cracks, and also depos- 
