412 On Sulphurets of Copper from the Canton (Ga.) Mine. 
\ 
Intimately associated with this is another new mineral also a 
phuret.of copper (CuS) corresponding in its formula with the 
protoxyd (CuO). A careful analysis of this gave: 
Copper 66205, sulphur 33°490, impurities 305 = 100. 
The impurities consist of silver and staurotide, it being impos- 
sible to find a crystal of the sulphuret which does not contain 
small but perfect crystals of this mineral. Hardness 1:5-2. 
Specific gravity 4°18, mean of three determinations. Lustre 
submeiallic, shining. Color and streak, blue-black. us in 
physical properties (except streak) and composition it is identical 
with ‘covelline; but while covelline is hexagonal this is mon- 
ometric and exactly similar to Harrisite and galena. It is also 
found impalpable. For this mineral I have proposed the name 
“Cantonite,” from the locality. It is found in the greatest quan- 
tity and in the largest crystals in contact with much decomposed 
ginous quartz, and in an impalpable state is disseminated 
through a veinstone of granular quartz and staurotide, in which 
mains fresh ‘and undecomposed, containing copper pyrites, 
seminated through its ee e cubes of pyrites, crystals of 
mispickel, copper pyrites and automolite, line and often fill creve 
ces in the veinstone. Pure galena in small bunches is scatte 
ot zh the slate, and the pyritiferous masses still alternate with 
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