166 DESCRIPTIONS OF MINERALS. 
tube ; but in the open tube, yields sulphurous fumes and a 
white sublimate of arsenous oxide. [B.B. on charcoal yields 
sulphur and arsenic and a magnetic globule; with borax a 
cobalt-blue globule. 
Dif, Unlike smaltite affords sulphur, and has a reddish 
tinge in its white color. 
Obs. From Sweden, Norway, Siberia, and Cornwall. 
Most abundant in the mines of Wehna in Sweden, first 
opened in 1809. 
Niccolite.—Copper Nickel. Arsenical Nickel. 
Hexagonal. Usually massive. Color pale copper-red. 
Streak pale brownish-red. Lustre metallic. email. ise 
Daoroe Gyan sa 
Composition. Ni As=Nickel 44, and arsenic 56; some- 
times part of the arsenic is replaced by antimony. Gives off 
arsenical (alliaceous) fumes before the blowpipe, and fuses to 
a pale globule, which darkens on exposure. Assumes a 
green coating in nitric acid, and is dissolved in aqua-regia. 
Diff. Distinguished from pyrite and linneite by its pale 
reddish shade of color, and also its arsenical fumes, and 
from much of the latter by not giving a blue color with 
borax. None of the ores of silver with a metallic lustre 
have a pale color, excepting native silver itself. 
Obs. Accompanies cobalt, silver, and copper ores in the 
mines of Saxony, and other parts of Europe; also sparingly 
in Cornwall. 
It is found at Chatham, Conn., in gneiss, associated with 
white nickel or cloanthite. 
Skutterudite. A cobalt arsenide of the formula Co As,, from Skut- 
terud, Norway. 
Breithauptite or Antimonial Nickel. NiSb=Antimony 67°8, nickel 
32°2—100. It has a pale copper-red color, inclining to violet, H.=5°6 
-6. G.=7°54, Crystals hexagonal. From Andrcasberg. 
Gersdorffite. A nickel arsenosulphide ; NiS,+NiAs,—Ni AsS= 
Arsenic 45'5, sulphur 19:4, nickel 35:1, but varying much in composi- 
tion. Color sulphur-white to steel-gray. H.=—5°5. G.=5'6-6% 
Udmannite or Nickel Stibine. An antimonial nickel sulphide, con- 
taining 25 to 28 per cent. of nickel. Color steel-gray, inclining to sil- 
ver-white. In cubical crystals, and also massive. H.—5-5°5. G.=6°45. 
From the Duchy of Nassau. 
Griinauite or Bismuth Nickel. A sulphide containing 31 to 88°5 of 
sulphur, 10 to 14 per cent. of bismuth, with 22 to 40°7 of nickel. 
Color light steel-gray to silver-white ; often tarnished yellowish. H.= 
4°35. G.=6°13. From the district of Altenkirchen, Prussia. 
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