2 
CHEMISTRY: WASHBURN AND NA VIAS Proc. N. A. S. 
a 
00 . 
c« O 
^1 
§•3 
>> « 
•§•1 
^ S 
cn 1) 
o :3 
o 
•+3 O 
c3 O 
1 S 
S 2 
u 
«Ih cu 
< .S 
03 
I 5 
5 o 
a; O 
O CD 
3 
SIUCA 
GLASS 
2.194- 
2.213 
1.457- 
1.460 
None 
TRIDYMITE 
0.8 =^ 
0.2 
0.38 ± 
0.08 
0.142 
6.3 ±0.6 
2.27 
1.475 
117° 
■I in M 
PT) cs; ^ »-j 
<6 <6 d <6 
W 
< 
n 
o 
1/1 
S 
CI 
o 
00 in 
CO d ^ <D 
2.83 
132 
8 
2.33 
1.484 
f-4 fh tn 
CsJ .-4 fH d 
Q 
Is 
o 
tQ. 
227° 
-H -H 
q vq Tij PO 
PO d ^ d 
3.09 
150 
8 
2.25 
1.483 
41 41 
00 O 
^ d d d 
CALCINED 
CHALCEDONY 
■31 
220° 
41 41 
00 Tjj r4 
csj d ^ d 
2.63 
131 
2.175 
1.456- 
1.470 
41 41 
i> vq PO PO 
c4 d ^ d 
QUARTZ 
o 
O 
ir^ 
-0.049 
CD 
CM 00 
« 
2.65 
1.544- 
1.553 
^ 
r» c c 
0.65 
0.25 
RAW 
FLINT 
2.61- 
2.63 
1.533- 
1.539 
q' ! 
< 5 
« <5 O. 
V 1 
2.55- 
2.61 
1.533- 
1.538 
Specific gravity, 
25725° 
Index of refrac- 
tion 
Inversion tem- 
perature ti 
Coefficient of 
cubical expan- 
sion near // 
(a) Per cent per 
degree X 10^ 
(b) Cc. per gram 
per deg. X 10^ 
Volume increase 
on inversion 
a >|3 at // 
(a) Per cent 
(b) Cc per 
gram X 10^ 
