MONOCLINIC DOUBLE SELENATES OF THE IRON GROUP. 
399 
Interfacial Angles of Potassium Ferrous Selenate. 
Angle. 
No. of 
measurements. 
Limits. 
Mean 
observed. 
Calculated 
ac 
= (100):(001) 
3 
G 
76 
/ o 
2- 76 
16 
76 8 
76 10 
as 
= (100):(101) 
— 
— 
— 
46 46 
sc 
= (101):(001) 
— 
— 
— 
29 24 
j 
cr 
= (001):(201) 
11 
62 
43- 63 
1 
62 47 
62 38 
cs 
= (001):(101) 
— 
— 
— 
37 58 
s'r' 
= (101):(201) 
— 
— 
— 
24 40 
r'a 
= (201):(100) 
1 
— 
41 11 
41 12 
r'c 
= (201): (001.) 
10 
117 
0-117 
30 
117 13 
117 22 
'op 
= (100):(110) 
12 
35 
40- 36 
11 
36 1 
36 1 
VV 
= (110) : (120) 
2 
19 
15- 19 
34 
19 25 
19 28 
pb 
= (120):(010) 
— 
— 
— 
34 31 
vv" 
= (110):(130) 
— 
— 
— 
29 21 
< 
p"’b 
= (130):(010) 
— 
— 
— 
24 38 
pb 
= (110):(010) 
— 
— 
— 
53 59 
pp 
= (110): (110) 
9 
71 
31- 72 
21 
72 2 
* 
pp 
= (110): (110) 
9 
107 
39-108 
18 
107 58 
107 58 
'cq 
= (001) : (Oil) 
20 
25 
45- 26 
26 
26 6 
* 
qb 
= (Oil) : (010) 
— 
— 
— 
63 54 
.Si 
= (011):(Oil)- 
8 
127 
19-128 
27 
127 49 
127 48 
r ao 
= (100): (111) 
— 
— 
— 
49 59 
oq 
= (HI): (Oil) 
— 
— 
— 
27 37 
M 
aq 
= (100) : (Oil) 
— 
— 
— 
77 36 
qo 
= (Oil):(Ill) 
— 
— 
— 
34 12 
L da 
= (Ill):(100) 
— 
— 
— 
68 12 
’ CO 
= (001):(111) 
— 
— 
— 
35 9 
op 
= (111) : (110) 
— 
— 
— 
43 42 
cp 
= (001):(110) 
14 
78 
44- 79 
8 
78 51 
* 
pd 
= (110):(111) 
— 
— 
— 
56 54 
o'c 
= (111): (001) 
— 
— 
— 
44 15 
LjP* 
= (110):(001) 
14 
100 
52-101 
30 
101 9 
101 9 
'bn 
= (010):(121) 
— 
— 
— 
53 41 
J 
no 
= (121): 111) 
— 
— 
— 
16 8 
> 
bo 
= (010):(111) 
— 
— 
— 
69 49 
_ os 
= (111): (101) 
— 
— 
— 
20 11 
f bd 
= (010):(Ill) 
—- 
— 
— 
65 17 
< 
o’s' 
= (111):(101) 
— 
— 
— 
24 43 
L do' 
= (HI): (HI) 
— 
— 
— 
49 26 
r sq 
= (101):(Oil) 
— 
— 
— 
38 31 
qp 
= (Oil):(110) 
13 
84 
57- 85 
27 
85 12 
85 8 
s 
| 
= (110):(101) 
— 
— 
— 
56 21 
IPS. 
= (HO): (Oil) 
14 
94 
21- 95 
8 
94 47 
94 52 
r s s 
= (101): (Oil) 
— 
— 
— 
44 55 
qn 
= (Oil): (121) 
— 
— 
— 
27 1 
np 
= (121):(110) 
— 
— 
— 
37 22 
qp 
= (Oil):(110) 
9 
64 
2- 64 
41 
64 23 
64 23 
ps' 
= (110):(101) 
— 
— 
— 
70 42 
L ps 
= (110):(Oil) 
9 
115 
19-116 
7 
115 37 
115 37 
C r'd 
= (201): (Ill) 
— 
— 
— 
34 22 
J dp 
= 111):(110) 
— 
— 
— 
93 7 
\pr' 
= (110):(201) 
4 
52 
22- 52 
32 
52 29 
52 31 
L r'p 
= (201):(110) 
4 
127 
28-127 
38 
127 31 
127 29 
Total number of 
measurements . 
166 
Diff. 
/ 
2 
9 
1 
9 
0 
3 
0 
1 
0 
4 
5 
0 
0 
LO fcO 
