94 
Proceedings of the Koyal Society of Edinburgh. [Sess. 
List of 1000 Kocks 
Group. 
Si0 2 . 
Ti0 2 . P2^5* 
H 2 0. 
ai 2 o 3 . 
Fe 2 0 3 . FeO. 
MgO. 
CaO. 
Na 2 Q. K 2 0. 
Total. 
Sp.Gr. 
3 
76-0 
•2 
•9 
12-3 
•9 
•9 
•2 
•2 
4-0 
4-4 
100-0 
75-9 
•5 -3 
•8 
12-3 
1-1 
1*4 
*3 
•9 
3 2 
34 
100-1 
75-2 
*7 
13-8 
•6 
1*4 
•1 
•7 
3-8 
3 3 
99-8 
74-6 
•2 
10 0 
3-8 
1-7 
•3 
2-4 
3 3 
3-4 
99-9 
74-1 
4*4 
12-4 
•3 
*2 
•4 
•3 
3*2 
5-1 
100-3 
73-7 
•4 
11’2 
1*3 
3-2 
•5 
2-8 
3 7 
1-9 
99-2 
73-4 
1-3 
12-1 
•9 
3-4 
1*1 
2-9 
3*9 
1*7 
100-7 
2-74 
72-6 
5-2 
12-4 
•7 
1-1 
•9 
1*7 
4*7 
99-3 
(2-34) 
723 
4-9 
11-6 
1*4 
1-1 
•5 
1-3 
4*1 
4-0 
101-3 
(2-36) 
21 rocks 
75-8 
•1 
1-3 
11*8 
1*3 
1-2 
•3 
•9 
4-2 
3-0 
100-1 
2-65 
y 
(2-36) 
±1-0 
±•6 
±•9 
±•7 
±•8 
=J=4-0 
4 
a a a 
abb 
76*4 
1*5 
14-2 
1-6 
•6 
1-8 
4-2 
100-3 
2-50? 
76-4 
•1 
1*0 
11*7 
•6 
•6 
•3 
1*6 
7-0 
993 
2-60 
76-3 
2*5 
12-6 
3-1 
•5 
•4 
1-3 
3*5 
100-2 
75*9 
1-0 
12-1 
2-8 
•8 
•1 
•1 
4-0 
4*3 
101-0 
75-7 
1*2 
12-6 
1*7 
•7 
1-6 
1*8 
4*5 
99-8 
75-5 
1-1 
146 
1-4 
10 
•3 
1-3 
1*0 
3*5 
99-7 
75-4 
15-5 
1*2 
1*4 
3*8 
97-3 
75-3 
11-4 
5-4 
•6 
•8 
1*4 
6-1 
101-0 
2-67 
74-8 
•3 
13*5 
5-0 
*7 
•9 
1-5 
33 
100-0 
2-67 
74-8 
•6 
11-6 
35 
•2 
•2 
'1 
4*3 
4-9 
100-2 
74-7 
•9 
11-9 . 
2-8 
•3 
•7 
2*9 
53 
99-5 
2-65? 
73-0 
33 
12-6 
2*5 
•3 
•7 
1*7 
5-9 
100-0 
73-0 
•1 
2-0 
13*7 
2-0 
1-1 
2 0 
1-5 
3-9 
1*5 
100-8 
2 -69 
72-8 
•2 
2*8 
12-2 
•4 
3*1 
•2 
•1 
3-4 
4-7 
100-1 
72*6 
3*0 
16-2 
2*7 
•5 
1*4 
•2 
3*4 
100-1 
72-1 
1*7 
14-0 
2*1 
2-4 
1-0 
2-4 
1*1 
33 
100-0 
2-55 
71-4 
1*4 
11-8 
5-6 
1*4 
•6 
•2 
4-2 
4-3 
100-9 
70-6 
6-0 
15-0 
IhT” 
•6 
12 
2-4 
1*6 
100-0 
(2-34) 
18 rocks 
74-3 
1*7 
13-2 
2*1 
1*1 
•6 
•7 
2-1 
4-2 
100 
2-62 
±1*1 
±1-3 
±1-1 
y — 
±•8 
±1*7 
(±6-0) 
(2-34) 
5 
a a a 
baa 
77*3 
•6 
14-6 
•4 
7-6 
•2 
100-3 
77*1 
•1 
•4 
13-3 
•8 
•2 
1-3 
4*4 
3*2 
100-8 
2*66 
76-6 
13-5 
•5 
1 
•7 
3 5 
5*5 
100-4 
76-4 
•2 
15-5 
•4 
2-1 
3 0 
2-3 
99-9 
76-3 
1 
•5 
12*5 
1-5 
*3 
•1 
•2 
3-9 
4-7 
99-6 
76-0 
•6 
11*8 
2-0 
•3 
•5 
3-4 
5 '6 
100-1 
75-8 
•4 
12*4 
•2 
1-3 
•3 
•8 
4*0 
4-6 
99-8 
75-4 
•6 
11-8 
1-8 
1-0 
•3 
3-7 
5-4 
100-0 
2-62 
75*4 
•1 
1-4 
13-6 
•2 
•4 
1 
•4 
. 4*6 
4*4 
100-7 
... 
