Classification of Igneous Rocks. 
131 
130 Proceedings of the Royal Society of Edinburgh. [Ses 
List of 1000 Rocks 
Group. 
SiOj. 
TiO a . P 2 0 6 . 
H,0. 
A1 2 0 3 . 
Fe 2 0 3 . 
FeO. 
MgO. 
CaO. 
Na^O. 
K 2 0. 
Total. 
Sp. Gr. 
41 
49-6 
•7 
6-0 
■4 
9*6 
5*6 
5*2 
1*3 
13*9 
4*9 
3*2 
100*3 
48-4 
■5 
•4 
3-8 
13*3 
4-4 
3*4 
8*4 
10*5 
3*4 
3*0 
100*0 
21 rocks 
54-1 
•5 
■6 
1-9 
47 
±1-4 
±2*2 
±T 
4 
±] 
1*4 
±•9 
±7*3 
42 
b a 6 
a ab 
57 3 
•4 
■2 
14*7 
1*2 
4*4 
7*8 
6*9 
1*3 
6*4 
100*6 
55-5 
•4 
15*4 
1*3 
4*5 
7*9 
6*7 
1*8 
6*6 
100*2 
2*70 
550 
15*7 
4*8 
5*8 
6*2 
11*2 
1*2 
1*5 
102*1 
2*84 
54-5 
1-1 
1 
16*5 
1*0 
5*7 
8*6 
8*0 
2*1 
3*3 
100*9 
54-4 
5*5 
12*9 
7*1 
12*8 
5*1 
2*1 
*4 
100*2 
54-1 
1*5 
15*0 
4*1 
5*1 
7*3 
7*7 
3*5 
100*3 
54-1 
1-2 
■i; 
16*4 
1*7 
5*3 
8*4 
8*1 
2*2 
3*3 
101*3 
53-2 
1*6 
16*2 
10*3 
6*7 
10*1 
1*9 
100*4 
53*1 
15*6 
2*3 
8*2 
5*8 
11*7 
1*9 
1*8 
101*2 
(2 : 56) 
527 
1*6 
14*1 
1*9 
10*2 
6*4 
9*4 
2*6 
*9 
99*8 
2*97 
52-3 
•6 
2-9 
14*0 
2*8 
4*6 
8*2 
7*4 
2*8 
3*9 
100*2 
52-2 
•4 
•1 
1-4 
14*7 
4*1 
7*7 
9*4 
8*4 
1*5 
*3 
100*2 
52-2 
2*2 
15*4 
4*3 
5*1 
8*9 
8*6 
2*1 
*6 
99*3 
2*85 
51-9 
1*0 
15*5 
12*9 
4*0 
13*8 
•5 
1*2 
100*8 
2*96 
51-7 
1-2 
•2 
•3 
15*2 
2*1 
8*5 
8*2 
8*7 
2*3 
1*8 
100*2 
51-5 
3*5 
14*4 
3*9 
5*3 
9*5 
9*1 
2*9 
*2 
100*3 
50-4 
1-5 
•5 
2*3 
12*3 
5*7 
3*2 
7*1 
1*0 
100*4 
2*8*8 
500 
1-4 
1*0 
*8 
12*3 
2*9 
5*8 
9*2 
10*2 
2*2 
5*0 
100*0 
49-8 
2-7 
*7 
15*3 
6*6 
7*2 
2*7 
4*4 
101 T 
49-5 
•8 
2*3 
16*8 
2*0 
6*6 
9*3 
11*2 
1*6 
100*0 
48-2 
10 
•1 
2*7 
18*3 
1*3 
6*1 
10*8 
9*4 
1*3 
*7 
99*9 
46-0 
•6 
11 
2*9 
12*2 
3*9 
4*6 
10*4 
9*5 
2*4 
5*8 
99*8 
22 rocks 
52-3 
•6 
•2 
1-8 
15*0 
3*1 
5*8 
8*2 
8*9 
1*9 2*7 
100*4 
2*90 
±1*6 
±1*2 
±1*1 
±' 
L*5 
± 
2*2 
±7*6 
(2*56) 
43 
b ab 
a b a 
54-4 
•3 
•3 ! 
1*2 
14*3 
6*3 
4*2 
5*9 
7*5 
3*4 
2*2 
100*0 
52-8 
•3 
*9 
13*3 
2*4 
8*7 
6*8 
8*6 
4*7 
1*5 
100*4 
2*93 
52-6 
1-1 
•3 
1*2 
150 
' 4 ’ 4 
5*8 
3*9 
7*8 
3*8 
4*0 
99*9 
52-0 
2*0 
14*0 
13 
*0 
3*0 
8*0 
3*0 
5*0 
100*0 
(2*65) 
51-6 
1-2 
1*6 
14*8 
5*3 
7*0 
6*3 
8*1 
3*3 
1*3 
100*4 
2*92 
51-2 
1*0 
■5 
2*9 
16*1 
4*7 
4*8 
7*9 
3*0 
3*5 
99*9 
510 
1-1 
1*3 
15*2 
8*7 
3*4 
11*4 
2*4 
1*1 
100*4 
2*92 
509 
•6 
*2 
15*7 
10*9 
6*0 
11*8 
2*0 
1*6 
99*6 
3*01 
50-3 
1-0 
•5 
3*8 
15*9 
8*2 
1*5 
7*9 
3*0 
3*5 
100*3 
50-2 
1-1 
2*4 
16*0 
5*8 
5*6 
10*9 
3*4 
•5 
100*8 
49-5 
2-9 
*9 
14*1 
6*1 
6*2 
6*6 
9*4 
2*3 
2*1 
100*1 
495 
18*0 
3*0 
6*2 
7*8 
2-5 
2*3 
49-3 
•4 
■2 
2*9 
17*4 
2*7 
8*3 
4**7 
8*4 
4*0 
1*8 
100*4 
1907-8.] 
— continued. 
if. Jahrb., 1901, vol. ii., p. 239. 
if. Jahrb., 1903, yd. i., p. 432. 
Pyr. apatite syenite (ijolite 
porphyry). 
Resembles augitite. 
Finland. 
Montana. 
N. Jalvrb. , 1901, vol. i., p. 225. 
N. Jahrb., 1901, vol. i., p. 225. 
N. Jahrb., 1901, vol. i., p. 70. 
N. Jahrb., 1901, vol. i., p. 225. 
iV. Jahrb., 1902, vol. i., p. 313. 
Hatch, Petrology , p. 147. 
N. Jahrb., 1901, vol. i., p. 225. 
/V. Jahrb., 1892, vol. i., p. 313. 
N. Jahrb., 1901, vol. i., p. 70. 
Q. Journ., 1884, p. 654. 
iV. Jahrb., 1903, vol. i., p. 432. 
J. B. Harrison, Rep. G.N.IV. Diet., ii., p. 11, 
1598. 
N. Jahrb., 1900, vol ii., p. 232. 
Q. Journ., 1884, p. 235. 
J. P. Iddings, B.U.S.G.S., 148, p. 135, 1897. 
iV. Jahrb, 1892, vol. i., p. 325. 
Whitman Cross, Table XII. 
N. Jahrb., 1903, vol. i., p. 432. 
J. S. Diller, B. U.S.G.S., 148, p. 185, 1897. 
J. B. Harrison, Rep. G.N.IV. Dist., ii., p. 6, 
1898. 
N. Jahrb., 1900, vol. i., p. 75. 
L. V. Pirsson, B. U.S.G.S., 148, p. 153, 1897. 
Volcanic rock. 
Volcanic rock. 
HyjD. andesite. 
Andesite. 
Andesite. 
Andesite. 
Hyp. andesite. 
Dolerite ? 
Minette. 
Diorite. 
Hyp. plag. basalt. 
Basalt dyke. 
Basalt. 
Gabbro. 
Syenite lamporphyre. 
Shonkinite. 
Mica andesite. 
Diabase. 
Norite. 
Leucite basalt. 
La Colonetta, Mt. Cimino. 
Fiescoli, Mt. Cimino. 
Aboran Island. 
Radicofani. 
Peel Island, Japan. 
Radicofani. 
Ototoshima, Japan. 
Alboran Island. 
Mt. Holyoke, Mass. 
Montana. 
Br. Guiana. 
Puebla, Mexico. 
Helt. 
Yellowstone Park. 
Sturgeon Falls. 
Tovo Buttes, Colo. 
Montana. 
New Mexico. 
Br. Guiana. 
Michigan. 
Montana. 
■J- B. Harrison, priv. contrib. 
if. Jahrb., 11900, vd. ii., p. 232. 
if. Jahrb., 1906, vd. i., p. 69. 
A. Geikie, ed. 1888, p. 149. 
kitsch, d. d. geol. Gesell., xix., part ii., p. 325. 
Hague and Jagger, B.U.S.G.S., 168, p. 98, 1900. 
Zeitsch. i d. geol. Ges., xix., part ii., p. 309. 
ft Journ., 1897, p. 409. 
Hague and Jagger, B. U.S. G.S., 168, p. 97, 1900. 
% ■£«., 1904? voL i., p. 46. 
"• 1903-4, suppl 18, p. 467. 
ft Journ., 187?, p. 166 
(Mean of 2=285). 
Diorite gneiss. 
Plag. basalt. 
Monzoni. 
Vitreous basalt, average. 
Anamesite. 
Augite andesite. 
Anamesite. 
Augite andesite. 
Gabbro porphyry. 
Diabase. 
Dolerite. 
Mica trap. 
Dolerite. 
Br. Guiana. 
Puebla, Mexico. 
Italy. 
Louisa, Hessen. 
Yellowstone Park. 
Eschersheim, Hessen. 
Seven Pagodas, Madras. 
Yellowstone Park. 
Niedergrund. 
Grenzebach. 
Rowley Regis, mean. 
