LINDGREN AND 
HILLEBRAND. 
] MINERALS FROM CLIFTON-MORENCI, ARIZONA. 43 
other minor ingredients found in solution, renders the calculation of 
molecular ratios not altogether certain in all cases. The composition 
as found is: 
Mn0 2 
MnO 
PbO 
ZnO 
CuO 
Mo0 3 
A1 2 0, 
Fe 8 (V 
H 2 
Insol. and silica 
CaO, MgO, Alk., and loss. 
a 56 
111 
6 
56 
26.48 
Id 
05 
:;i 
b 
<i:; 
1 
01 
'M 
03 
7 
22 
45 
Total 100. 00 
The material available did not permit the quantitative determina- 
tion of the vanadium, which may be present in rather more than a 
mere trace, but neither it nor the phosphorus can influence mate- 
rially the ratios given below. The vanadium would be effective in 
two ways: (1) by requiring a base for its neutralization, if existing as 
an acid constituent, and (2) by liberating chlorine when acted on by 
hydrochloric acid, and thus affecting the values found for peroxide 
oxygen. If the iron exists in the ferrous state, it too would affect 
the values found for the peroxide oxygen, and consequently for both 
the oxides of manganese. Assuming it to so exist and applying the 
proper corrections, also deducting from the lead oxide an equivalent 
for the molybdenum, assuming its existence as molybdate of lead, the 
following are the results: 
Mn0 2 56. 68- 
MnO 6. 11- 
PbO 26. 96- 
- 87.0=0.6515 
- 71.0= .0861 
-222.9= .1165 
- 72.0= .0126 
- 81.0= .0012 
- 79.0= .0006 
- 18.0- .0572 
= 3.00 
FeO 91- 
ZnO 10 
CuO 05- 
H 2 1.03- 
■0.217 = 1.00 
= .264 
«Mean of 56.10 and 56.16. Total Mn as MnO from MnSC 
per cent. 
i> With a little Ti0 2l P 2 5 , and V 2 O f> . 
"State of oxidation not known. 
d Nothing at 100°, only 0.14 per cent below 200°. 
) 4 , 52.38 per cent. 
Peroxide oxygen, 10.31 
