246 
The America?i Geologist. 
April, 1899 
N 
•-t 
Summit 
Stevens 
Pottery 
Name of 
Clay 
About 
35% 
5^ c 
About 
96% 
About 
97% 
About 
97% 
Kaolinite 
> 
Feldspar 
Abundant 
up to ,1, 
of an inch 
in 
diameter 
Abundant 
up to j„\,y 
of an inch 
in 
diameter 
Occasional 
grains re- 
vealed by 
high pow- 
ers* 
"-t 
rt 
Quartz 
Many 
prisms and 
cleavage 
scales 
Compari- 
tively rare 
F"ew 
extremel}' 
minute 
scales 
Few 
scattered 
cleavage 
crystals 
Muscovite 
an 
^ 
W 3 
S ' 
Biotite 
Occasional 
Crystals 
Abundant 
TOO ""50 
of an inch 
in 
diameter 
Few 
small 
Crystals 
Magnetite 
7^ 
y 
-1 
Titanite 
> 
0- 
Hema- 
p tite or 
Limo- 
nite 
1? 
Calcite 
Traces 
throughout 
the clay 
Pro- 
Chlorite 
Abund- 
ant 
Organic 
Matter 
