122 CONTRIBUTIONS TO MINERALOGY. [bull. 262 | 
2. AMBLYGONITE. 
The occurrence of amblygonite at the lepidolite mine at Pala, Cal., 
has already been noticed, and a somewhat fuller description of the 
mineral is here given. A large deposit has been uncovered, and the 
indications seem to show that it is merely a small part of an extensive 
body of massive amblygonite. The mineral usually occurs pure; very 
rarely small amounts of lepidolite are present with it. Frequently 
broad cleavage faces with irregular outlines can be seen. The color 
is white and in thin pieces the mineral is translucent. It fuses easily, 
coloring the flame red, and in powder is difficultly decomposed by 
sulphuric acid. 
An analysis of a specimen kindly presented by Mr. G. F. Kunz 
gave the writer the following results: 
P 2 5 •__. 48.83 
ALA 33.70 
Fe 2 3 12 
MnO 09 
MgO 31 
Li 2 9. 88 
Na 2 14 
H 2 5. 95 
F 2. 29 
Ti0 2 none 
101.31 
Less O 96 
100. 35 
Regarding fluorine and hydroxyl as isomorphous, in the specimen 
analyzed the latter greatly predominates over the fluorine. The water 
was determined by igniting the mineral with lead oxide, previous!! 
heated nearly to fusion. Three determinations gave the loss of weight, 
due to the escape of water, as 5.89, 6.01, 5.95 per cent. The loss of 
the mineral on ignition was 8.03 per cent, equaling the sum of the 
water and fluorine content. 
3. BOOTIIITTC. 
A specimen of a pale- blue copper sulphate was collected at the 
copper mine near Campo Seco, Calaveras County, Cal., by Mr. James 
Wise and kindly presented to the writer for investigation. The pale- 
blue color suggested that the mineral might be boothite instead of the 
more frequently occurring chalcanthite. The results of a chemical 
analysis have shown that the mineral is boothite, thus affording a 
second locality for this interesting mineral. Careful quantitative 
determinations of hydrous copper sulphates will probably show that 
the heptahydrate is not so rare as may be supposed. 
