MONOCLINIC DOUBLE SULPHATES CONTAINING AMMONIUM. 
27 
Comparison of the Interfacial Angles (continued). 
Angle. 
RbMn sulphate. 
CsMn sulphate. 
AmMn sulphate. 
[ ao 
= (100) 
: (111) 
o 
48 
34 
o r 
47 43 
48 
8 
1 °9 
= (in) 
(Oil) 
27 
4 
26 50 
26 
40 
Ui 
= (100) 
(011) 
75 
38 
74 33 
74 
48 
1 qo' 
= (011) 
(111) 
34 
40 
35 5 
34 
38 
{ o'a 
= (111) 
(100) 
69 
42 
70 22 
70 
34 
f CO 
= (001) 
(111) 
34 
6 
33 38 
33 
38 
1 op 
= (111) 
(HO) 
42 
57 
42 23 
42 
41 
I C P 
= (001) 
(HO) 
77 
3 
76 1 
76 
19 
I P 0 ' 
= (110) 
(HI) 
58 
25 
59 8 
59 
10 
1 o'c 
= (111) 
(001) 
44 
32 
44 51 
44 
31 
[bo 
= (010) 
(111) 
70 
34 
70 58 
70 
46 
{os 
= (111) 
(101) 
19 
26 
19 2 
19 
14 
[bo 
= (010) 
(111) 
65 
25 
65 27 
65 
21 
[o's' 
= (111) 
(101) 
24 
35 
24 33 
24 
39 
f sq 
= (101) 
(011) 
37 
35 
37 9 
37 
6 
i qp 
= (011) 
(110) 
87 
20 
88 36 
88 
8 
Ip 
= (110) 
(101) 
55 
5 
54 15 
54 
46 
fs'q 
= (101) 
(Oil) 
44 
58 
45 9 
44 
49 
5 9P 
= (011) 
(110) 
63 
10 
62 30 
62 
34 
\ps' 
= (110) 
(101) 
71 
52 
72 21 
72 
37 
[/O' 
= (201) 
(111) 
34 
54 
35 14 
35 
13 
5 °'V 
= (111): 
(110) 
92 
26 
92 13 
91 
45 
Ip-' 
= (110) 
(201) 
52 
40 
52 33 
53 
2 
Volume. 
Relative Density .—-Five determinations by 
following results :— 
the immersion 
method yielded the 
I. Density for 1G ‘2/4° 
. 1-8324 
For 20°/4° 
. . . 1*8317 
II. „ 15°‘7/4° . . 
. 1-8300 
„ 20°/4 o 
. . . F8292 
III. „ 16°-l/4° . . 
1— 1 
oo 
CO 
i— 1 
CO. 
„ 2074“ 
. . . 1*8312 
. IV. „ 17°‘6/4° . . 
. D8312 
„ 2074” 
. . . F8308 
V. „ 17°‘3/4° . . 
. D8329 
„ 2074° 
. . . 1-8324 
Mean . . . 1 '8311 
Accepted value for 20 /4°, 1'831. 
A determination by Schroeder # gave the density I‘825. 
Molecular Volume .— —; = — = 212*13. 
d 1-831 
* 1 Journ. fur Prakt. Chemief 1879, [2], 19, 266. 
