418 Dr. Genth’s Contributions to Mineralogy. 
It occurs associated with Harrisite, etc., in crystalline masses 
with perfect cubical cleavage. The color is dark indigo-blue, 
the lustre between submetallic and resinous. Its powder is blu- 
ish-black, when rubbed in the agate mortar, indigo-blue and 
shining. It is soft, very friable and somewhat sectile. 
Sometimes it contains a nucleus of Harrisite (analysis Il). It 
should be remarked that the angles of pyrites associated with 
the Cantonite have frequently rounded edges, and that black 
oxyd of copper often occurs with it. To free it from the latter 
the material for analysis was first digested with diluted chlorhy- 
dric acid. It contains: 
I, II. (containing Harrisite.) 
Sulphur, : - 32-765 28-664 p. c. 
Selenium, - - tr ace 
Gilver, - = ~- : 0°355 0305 “ 
Copper, - - - 65604 - 40-791 “ (from the loss.) 
tad, - - : 0107 0025“ 
Iron, - - - 0251 0084 “ 
Insoluble, a PF 0-157 0-131 “ 
99-239 100-000 
4, Linneite. 
- @. Carrollite (Copper-linneite) from the Patapsco Mine. 
Although the constitution of this interesting mineral has been 
satisfactorily established by Smith and Brush (Am. Jour. Sci, 
the former appeared to be more protected. After having aban- 
doned the idea of getting pure material by the help of chemicals, 
I was fortunate enough to obtain a perfectly pure specimen, 
weighing about four grammes. 
The culor was between steel-grey and tin-white, with a very 
faint reddish hue. It was not crystallized, and like all the car- 
- rollite which I have seen, did not show the least indication of 
cleavage, but a subconchoidal fracture. 
_ Dissolves slowly in nitric acid without separation of sulphur. 
The results of the analysis agree with those of Smith and Brush. 
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