450 J.D. Dana—Sand and Kaolin from Quartzyte. 
rock in this Journal for 1824 (viii, 17), says of it that ‘it is 
wrought into millstones ofter the manner of the Paris buhrstone,” 
and goes by the name of the Pittsfield buhrstone. Feldspar 
exists in some of the cavities. Professor E. Hitchcock recog- 
nizes the feld 
Geological Report of 1842, saying (p. 587), that the buhrstone is 
d 
ingredient.” The name gneiss given it is not so far out of the 
the quartzyte elsewhere. Professor Hitchcock mentions another 
: “ce ; 
locality of it: “four or five miles south of the spot where mill- 
rofessor Hitchcock states, in the Vermont Report, that the 
ownal, Vermont, as affording it abundantly. He also states in 
the chapter in his American Geolog 1. I, Part ii), on the 
ak Hill G 
and the adjoining part of the town of Adams), which consists of 
quartzyte with some micaceous and gneissoid beds, has a layer of 
have observed, 
At a locality of kaolin in the south part of Kent, the rock 
from which the kaolin originated is, as stated by Professor C. U. 
Shepard in his report on the Mineralogy of Connecticut (p. 74), @ 
kind of “graphic granite which must have been free from mica,” 
in other words, a rock consisting of quartz and feldspar; and at 
