AND LEICESTERSHIRE AND THEIR RELATIONS TO GEOLOGICAL STRUCTURE. 85 
Kocks from the Melton Mowbray and Irthlingborough Districts (continued). 
Summary of Magnetic Properties (continued). 
Sped- 
Weight 
1 
Magneti¬ 
sing 
1 
Volume-susceptibility 
in 10“^ C.G.S. units. 
Refer- 
Description and locality. 
of 
Density. 
force H 
ence 
men No. 
specimen. 
in C.G.S. 
units. 
Individual 
Average 
page. 
values. 
value. 
! L. 100 
1. Igneous Rocks (continued). 
gr- 
Basic granite, marginal, Brazil 
8'025 
2-780 
124 
22 
99 
Wood 
157 
23 
L. 101 
Hornblende-diorite, Brazil Wood . 
9-205 
2-810 
156 
11-6 ' 
1 
12 
200 
12-1 
r 
L. 103 
Basic dyke in granite. Mount 
8-610 
2-770 
50 
74 ' 
1 
80 
Sorrel 
Basic Dykes, intrusive in 
Cambrian Rocks. 
80 
85 
r 
f 103 ! 
L. 110 
Camptonite, intrusive in Hartshill 
4-908 
2-640 
128 
20 ] 
1 107 ; 
quartzite, Nuneaton 
483 
21 
21 
125 ! 
483 
22 
1 and 
Charnwood Forest Bocks. 
( 134 
L. 13 
Augite-granophyre (“ syenite ”), 
6-284 
2-710 
200 
4-1 ^ 
Groby Quarry 
335 
4-0 
4 
102 
440 
3 - 95 J 
106 ! 
L. 10 
Basic granophyre (“greenstone”). 
9-650 
2-980 
137 
7-95' 
L 
ft • 9 
1^125 ' 
Newhurst Wood 
241 
8-4 J 
and 
L. 6 
Porphyroid (dacite), High Sharpley 
8-200 
2-660 
230 
1-2 1 
1 
1-3 
J 134 1 
556 
1-4 
H. Iron Ores. 
(a) Noiihampton Sands, Irthling- 
hoi'ough District. 
Green Carbonate Ores, unoxidised. 
from underground workings. 
1 
99 
Chalybite, massive crystalline (in- 
12-182 
3-720 
47 
55 - 5 ‘1 
59 
serted for comparison) 
82 
62-8 J 
N. 89 
Sandy oolitic ore. No. 2 pit. 
10-275 
2-340 
66 
20-9 1 
99 
N. 91 
Irthlingborough tunnel 
90 
23-4 J 
1 
Compact oolitic ore. No. 2 pit. 
13-845 
3-110 
100 
28 
28 
Irthlingborough tunnel 
N. 88 
PartiaDv oxidised oolitic ore. No. 2 
4-981 
2-770 
200 
29-6 ■) 
pit, Irthlingborough tunnel 
100 
67 
29-4 
28-2 
> 
29 
44 
28-6 J 
(A second specimen). 
7 - 860 
2-770 
196 
34-7 ') 
88 
97 
30-6 
> 
32 
47 
30-7 ^ 
i et 
N. 90 
(A third specimen). 
by magn 
etometer 
— 
— 
30 
seg. 
105 
Fine-grained silicate ore. No. 2 pit. 
i3-645 
3-290 
50 
35-8 d 
36 
N. 82 
Irthlingborough tunnel 
Brown Limonite Ores, oxidized, 
from surface outcrop. 
Sandy oolitic ore, Clarke’s pit. 
98 
37-3 J 
10-721 
2-210 
197 
8-3 
8-3 
near Rushden 
N. 83 
Compact concretionary “ boxstone,” 
Barlow’s Pit, Finsdon 
by magn 
etometer 
64 
6 
! 
