hillebhand] NOTES ON MARIPOSITE AND TWO SULPHATES. 
75 
Si0 2 .... 
TiO, .... 
A1 2 :) .--- 
Cr 2 :> ... 
Fe 2 : , ... 
FeO 
CaO 
MgO 
K 2 
(NaLi) 2 0. 
H 2 
Sp. gr. 
Green. 
55.35 
.18 
25.62 
.18 
.63 
.92 
.07 
3.25 
9.29 
.12 
4.52 
100. 13 
2.817,29°.5 
White. 
56.79 
} 25.29 
1.59 
.07 
3.29 
8.92 
a .17 
4.72 
100. 84 
2.787,28°.5 
a Contains some K. 2 0. 
No water was lost below 300°. The reaction for litbia was very 
strong. The color of the green mariposite is evidently due to chro- 
mium. 
11. Two Sulphates from Montana. 
Mr. W. H. Weed collected in the St. Paul mine, near Whitehall, 
Montana, a magnificent specimen of a compact soluble fibrous sulphate, 
supposed to be melanterite. It seemed to be a filling between fragments 
of broken rock. Outwardly it was white from dehydration, but at 
some depth the unaltered green mineral was to be found. This had 
the following composition : 
