Lezvinso/i-Lessi/igs Classification of Rocks. 
361 
Specific 
Gravity 
S 
Orthoclase 
Albite (Dana 327) - 
Amorthite (Dana 357) 
Leucite 
Jadeite 
Labradorite (Dana 357) 
Quartz 
Diopside (Dana 390. 6)* 
Tremolite (Ibid., 7)* 
Diopside (Dana 390. lO)* 
Uralite (Ibid., ii)* 
Pvroxent- (Dana 39 1) 
\la,i;netite (Fe..,04) 
Hematite (FegO.,) 
Corundum (AlgO.,) 
Rutile 
Zircon 
Enstatite (Dana 11) , 
Olivine (Dana 7) .' , 
Augite (Dana 66a) , 
Leucite 
Kaliophvllite 
Nepheline(Na30, AlaOa.aSiO") 
Xepheline(3NaoO,K30,4Al.,03,()Si03 
Olivine (Forsterite, Dana 541.7) 
Woiiastonite 
Enstatite 
Diopside 
Tremolite 
Microcline (Dana 323. i ) 
Andesine (Dana 327) 
Andesine (Abj An J 
Jadeite 
Theo- 
retic 
.specific 
volume 
V ' 
2.56 
2.62 
2.758 
Theo- 
retic 
specific 
volume 
V 
2.7003 
2.6 
3-3(3-2) 
30 
3-249 
3 003 
3187 
4-.g-5.2 
5.24 
4,0 
4.25 
44-47 
3-27 
3-35 
2.479 
2 5-2.6 
2.55-2.65 
380 
404 
179 
352 
308 
978. 
44 
116. 
304. 
05. 
62. 
70 
41. 
98 
132. 
104 
159 
2Q2 
lq6 
185 
418 
''2 
Actual 
specific 
volume 
V 
22.50: 
74 
248 . 
64 
2.9 
3-2 
2-3-3 
1-2.9 
2.694 
2-33 
44 
35- 
44. 
76. 
15' 
106 
95 
413 
44 
40 
33 
74 
141 
1 96 
274 
137 
140 
217 
200 
100 
464 
22.6 
67.4 
142.7 
66 
243 
47-3-44-6 
30-5 
25.5 
18.8 
3-39-1 
34-1 
43 8 
67.5 
175 
126 (122) 
III (107) 
481 
43 
40 
31.2 
67.5 (66.4 
133(143) 
214 
297 
148.5 
173 
41 
Per ct. 
of units 
of 
actual 
volume 
1 . I 
1.08 
1-13' 
0.89 
o.97| 
1. 15 
(3) 
0.91 
0.96 
0.98 
0.1 
1.15 
1.18 (1. 15 
I. 16 (I.I2) 
I . 16 (I. 10) 
0.96 
0.98 
0.93 
0.91(0.89) 
0.94(1.01) 
. 1.09 
1.08 
I . 22? 
57 
49 -S 
5^ 
41 
56.. 
47-4 
51-3 
58 
46 -9 
53-7 
48.8 
36-4 
45-4 
41 
25 
42 
41 
Considering- the formula ( called in France the "third for- 
mula of Clapeyron"). 
Z equals {T^E) X {u'-ii) X {dp^dT). 
Whence {dp-^dT) equals £Z^ [r( ?/'-?/)]. 
Here Zt=the latent heat of transformation; r=the abso- 
lute temperature; 7/-=the initial volume and ;/'=the final vol- 
ume of the body. 
The sign of {dp^dT) depends on //'-;/. 
If //' is greater or less than //, so dp^dT is greater or 
less than o. 
For //'>//, increase of pressure raises the tt'mpetature of 
