168 j DESCRIPTIONS OF MINERALS. 
Roselite is a rose-red triclinic arsenate of cobalt. 
Bieberite or Cobalt Viiriol. Has a flesh-red or rose-red tint, and 
astringent taste. CoO,8+7aq = Sulphuric acid 28°4, cobalt oxide 
25°5, water 46:1. 
Morenosite. A nickel vitriol, NiO,S+‘%aq, having apple-green to 
ereenish-white color. Lindackerite, hydrous nickel-copper arsenate. 
Zaratite or Hmerald Nickel. Incrusting, minute globular or stalac- 
titic. Color bright emerald-green. Lustre vitreous. ‘Transparent or 
nearly so. H.=3-3°25. G.—2°5-2°7. It is a nickel carbonate, con- 
taining nearly 30 per cent. of water. B.B. infusible alone, but loses 
its color. Occurs with chromic iron and magnesium carbonate on 
serpentine, in Lancaster County, Pennsylvania. 
Remingtonite. A hydrous nickel carbonate, rose-colored, from 
Finksburg, Md. 
Spherocobaltite. A cobalt carbonate, Co O,C, from Saxony. 
Ni-kel Silicates. Genthitc is a hydrous magnesium and nickel sili- 
cate, of a pale apple-green color, yielding in one analys's &0 per cent. 
of nickel oxide. From Texas, Lancaster County, Pa., and other 
localities. dttisite, from Rodttis, Voigtland, is similar. Pdmelite is 
an impure apple-green silicate, affording in one case 15°6 per cent. of 
nickel oxide. Alipite is similar; so also Garnicrite (and Moumeite), 
from New Caledonia, and worked there for nickel. 
General Remarks.--The two arsenical ores of cobalt afford the 
greater part of the cobalt of commerce. The earthy oxide when 
abundant is a profitable source of the metal. Hrythrite (Cobalt 
Bloom) occurs abundantly with other cobalt ores at its localities in 
Saxony, Thuringia and Hesse Cassel. Arsenopyrite (mispickel) yields 
at times 5 to 9 per cent. of cobalt. Cobalt is never employed in 
the arts in a metallic state, as its alloys are brittle and unimpor- 
tant. It is chiefly used for painting porcelain and pottery, and is 
required for this purpose in the state of an oxide, or the silicated 
oxide called smalt and azure. Zajffre is an impure oxide obtained in 
the calcining of the ore with twice its weight of sand; and from it 
the smalt and azure are produced. Nickel is worked in Germany, 
Austria, Russia, Sweden, England, United States, and New Caledonia. 
It is obtained largely from the copper nickel (niccolite) and chloan- 
thite, or from an artificial product called speiss (an impure arsenide), 
derived from roasting ores of cobalt containing nickel ; from siegenite 
(or nickel-linneite), a sulphide of cobalt and nickel ; from millerite’, 
in part ; from the apple-green silicate ; and largely from pyrrhotite 
or ‘‘magnetic iron pyrites.” At the Gap Mine, near Lancaster, Pa., 
the ore is millerite and pyrrhotite ; in Missouri, the siegenite; in 
New Caledonia, chiefly the silicate. 
Nickel also occurs in meteoric iron, forming an alloy with the iron, 
which is characteristic of most meteorites. The proportion sometimes 
exceeds 29 per cent. 
As nickel does not rust or oxidize (except when heated), it is supe- - 
rior to steel for the manufacture of many philosophical instruments. 
A. alloy of copper, nickel, and zinc (one-sixth to one-third nickel), 
constitutes the German silver, or argentane. 
‘‘German silver” is not a very recent discovery. In the reign of 
William III, an act was passed making it felony to blunch copper in 
