164 Scientific Intelligence— Mincralogy. 
evidently the result of their decomposition. Semmola, however, has 
described a substance occurring in small tubular erystals belonging 
to the hexagonal system, which, according to him, are pure oxide of 
copper, Cu. To this substance he has given the name of Tenorite. 
The oxide of copper found at Copper Harbour is generally compact, 
though the purer specimens have a crystalline structure. Mr Tesche- 
macher has, however, two specimens, which he has kindly allowed 
me to examine, in which this substance is distinctly erystallised in 
cubes, with their solid angles truncated. ‘The question arises, was 
the substance described by Semmola as crystallised in the hexagonal 
system, really Cu, or is this substance dimorphous ¢ 
Some portions of the oxide of copper from Copper Harbour are 
almost chemically pure, though it is generally mixed with a little 
silicate of copper. One of the purest specimens contained only 1:2 
per cent. of impurities, mostly silica, with traces of lime and iron. 
As the oxide of copper of this remarkable vein has not been 
mineralogically described, the following description is added ; 
Crystallised in cubes, with their solid angles occasionally trun- 
eated ; generally, however, massive, with crystalline structure, some- 
times earthy ; no traces of cleavage. H. = 3; G.=6-25, colour, 
steel grey to black; lustre metallic, the earthy varieties acquire a 
metallic lustre on being scratched or cut with a knife ; opaque. 
Chemical composition Cu, almost pure; containing copper 79°86, 
oxygen, 20°13.—(Silliman’s American Journal of Science and 
Arts, vol. viii., No. 23, p. 273.) , 
4. On Arkansite—This mineral, which Mr J. D. Whitney makes 
out to be Brookite, has been examined by M. 'Teschemacher (Proc. 
Bost. Soc. N. H., April 1849, p. 132), and he gives the following for 
its angles—(See figure in Silliman’s Journal, vol. iv. p. 279)—M : M 
=100° and 80°. M:c=138° 35, c:c = 185° 45’, a:a = 125% 
Shepard made M:M 101° to 101° 15’, and a:a 128°. Accord- 
ing to the measurements of M. Teschemacher, the angles are those 
of Brookite. 
5. Baierine—(L’ Institut. No. '793).—The metal pelopium, has 
been found in the Columbite of Bavaria, by G. Rose, and in that of Li- 
moges by Damour. It is proposed to distinguish the variety of Co- 
lumbite by the name Baierine, given it by Bendant. The specimens 
from these two localities agree well in external characters, and in 
analyses. 
6. Notices of American Minerals. By Professor C. N. Shepard. 
—(1.) Pyrophyllite, in beautiful white stelle, occurs, along with very 
brilliant and perfect crystals of rutile, on a soft, semi-steatitic kyanite, 
at Crowder’s Mountain, in North Carolina ; from which region I 
also possess large masses of deep blue Lazulite, associated in some 
instances with topaz, the latter in distinct crystals. 
