61 
washing well to remove all the calcium sulphate, and found to con- 
sist of calcium aluminate and undecomposed alunite. 
The results shown in Table T. were obtained by treating the 
0.5 gm. of the mineral with 0.5308 gms. of caustic lime, which is con- 
siderably more than necessary to satisfy the following equation, the 
theoretical quantity being 0.2029 gms. of OaO or 0.2679 Ca(OH),. 
K 2 S0 4 • 3HO AISO 4 • 3 Al (OH) 3 + 60a (OH) 2 — : 
K a SO, 
+ 30aS0 4 +3CaAI 2 0 4 + 12H 2 0. 
W 
H 
i— • 
P 
P 
< 
£ 
£ 
c 
£ 
< 
a 
g - 
P fe 
w C 
HH y 
H g 
i- H 
5 < 
EH W 
K 
§ H 
ft 
0 
M 
H M 
GO 
W 40 
1 R 
P P3 
W 
co 
CD 
> o £ 
O -4- 
v • c X 
c W «e 
o 
o «- — — 
is ° 4! «§ 
o . - o -*- 
Jg° -- J 2 
° 2 
s © 
•S tti 
o 
ro 
x 
o 
<33 
£ b 
& 
O 
cc 
cS 
<13 
H 
-fli 
. o 
X 
o 
2 £ 
> pd 
d 
ft 
sh 
o 
ft 
Ol 
VO X CO l> 
rH 
CO lO CO o 
CO 
VO tH Ol 
c- 
H Ol N H : 
: a 
cdowh : 
I r— ‘ 
oi co co o : 
CO 00 00 <33 
Ol 
CD L~ CO 
r/j 
co co co o 
o 
O !C !0 50 
o 
e co 
VO co 00 © CO 
O 
- 
o 
G 3 C vO o t - 
O i* 50 O Cl 
CC Ol CO 'O'. CO 
o 
* 0 CO X GO C! 
- CO 
tHOI^XO 
O 00 
CD X X 00 03 
o 
i-H O l 
t-h 
rH 
t— ' o -t< co i — I 
Ol CO 
OOM-+N 
-+ CO 
-r o Tt< O 
CO rH 
t- Ol Ol Ol o 
01 -* 
00 Cl X Tf no 
CD 
01 
co CO CO cc 
CO tH 
r — 1 01 Ol Ol Ol 
01 •-< 
r- 01 Ol Ol Ol 
01 
r- 
1 - HHNO 
co r - 
t- co oi co 
-f< <© 
00 Ol lO l'- Ol 
-f -t< 
Oi VO Ol 00 
1-0 
iCWOrt® 
Ci 
Ol 
CO vO vQ no CO 
CO O I 
CO VO CO CO GO 
co Ol 
>n co co i- w 
w 
Q 
oi cc i- £ ", 
x — 
ft-§ 
Total 
1 
c£ . 
oi co Ti' i> ' 
2 : 
Total 
1 
01 co i 2 • 
Total 
- 
i- 
Ol 
01 
Ol 
- COO 
a 4 , n <, * 
: co 
: co 
> 
O rH 
• 
• r— * 
r. # 
• tH 
" •> " *» 
° 
,=: 
o 
. o 
. o 
CJ O 
£ ^ g T • 
« o 
p p _ 
^ r, * 
CJ ^ 
■ 
■ ^ 
;» 3 
o 
d no 
bCo 
o 
o 
m 
" 
~ 
& 
o 
r^\ 
: 
P 
CJ 
>. P vp 
"S 2 Lfs 
:> 5o 
r CO >o 
b. : o 
CO 
Ci 
^ 5 
-.rD P 
'•aw 
H •* 
P" 
CO 
CO 
T H 
m 
CO 
m 
:oi 
00 
o 
K 
lO 
Co l 
00 
ITS 
o 
© 
CO 
be 
CO 
The above figures proved that almost saturated but still weak 
(one-fiftieth normal) solution of Ca( OH), under suitable condi- 
tions, completely decomposes alunite, all the potash going into solu- 
