396 Miscellanies. 
of Brunswick, Stromeyer and self followed up the examination. 
The ore is found in minute thin hexagonal plates, which seem to be 
regular, and in interspersed particles, on galena and speiscobalt. 
Fracture uneven, passing into small conchoidal. ‘The terminal planes 
are of a high metallic lustre, the planes of fracture shining. The 
color is a light copper-red, with a strong inclination to violet. ‘This 
bluish exterior resembles certain variegated colors, but the character 
is the same in its fresh fracture. The powder is reddish-brown. 
The ore is brittle. Its hardness rather that of copper-nickel, being 
scratched by felspar, but scratches fluor. The specific gravity can- 
not as yet be ascertained, on account of the smallness of the speci- 
mens. Stromeyer’s analysis is, nickel 31.207, antimony 68.793 ;= 
We gave it the name of Antimonial Nickel saapoacey Nick- 
el). —Hausman.—Ib. 
10. Account of Artificial Felspar, by Professor Kersten.—Pro- 
fessor Kersten, as appears from a number of Poggendorf’s Annalen, 
No. 22. for 1834, has found distinctly formed crystals of prismatic 
felspar on the walls of a furnace, in which copper slate and, copper ores 
were melted. Among these pyro-chemically formed crystals, some 
were simple, others twin. The surface of the crystals was smooth 
or vertically streaked ; fracture conchoidal. Lustre of the crystals 
vitreous, and color rose red, passing into violet blue. Are opaque, 
brittle, and hardness=6 of Mohs’ scale. Chemical trials proved 
that they are composed of silica, alumina, and potash, consequently 
the same constituents as felspar. As accidental parts, traces of man- 
ganese and lime may be mentioned. Mitscherlich, who examined 
these artificial felspar crystals, says, they exhibited the primitive 
planes of the oblique prism, and were truncated on the acuter lateral 
edges ; a distinct cleavage was observed parallel with the truncating 
and terminal planes, which meet under an angle of 90°. Hitherto 
every attempt to make felspar crystals by artificial means has failed ; 
ence, in a geological point of view, this fact of Kersten’s is of very 
great importance.— Ib. 
11. Crystals of Oxide of Chrome.—Professor Wéhler has pre- 
pared beautiful crystals of this mineral. These crystals were both 
single and twin, belonging to the same rhomboidal series as corun- 
dum. One of the most interesting features in these crystals is their 
great hardness, it being equal to that of corundum.— Ib. 
