COBALT AND NICKEL. 163 
Obs. Occurs imbedded in granite, gneiss, mica schist sye- 
nyte, and in granular limestone. Sometimes associated with 
tite, as at the Grisons. Yrieix in France, Castile, 
Brazil, and Arendal in Norway, are some of the foreign 
localities. 
In the United States, it occurs in crystals in Maine, at 
Warren; in New Hampshire, at Lyme and Hanover; in 
Massachusetts, at Barre, Windsor, Shelburne, Leyden, Con- 
way ; in Connecticut, at Monroe and Huntington ; in New 
‘York, near Edenville, Warwick, Amity, at Kingsbridge, and 
in Essex County at Gouver neur ; in Pennsylvania, in Chester 
County; in the District of Columbia, at Georgetown ; in 
North Carolina, in Buncombe County ; in Georgia, in Lin- 
coln and Habersham counties ; at Maonet Cove in Arkansas. 
The specimens of limpid quartz, penetrated by long aci- 
cular crystals, are often very handsome when polished. “A re- 
markable specimen of this kind was obtained in Northern 
Vermont, and less handsome ones are not uncommon ; they 
are found in North Carolina. Polished stones of this kind 
are called fléches @amour (love’s arrows) by the French. 
This ore is employed in painting on por ee and quite 
largely for giving the requisite shade of color and enamel 
appearance to artificial teeth. 
Octahedrite (Anatase) ; Brookite. These species have the same com- 
position as rutile. Octahedrite occurs in slender nearly transparent 
octahedrons, of a brown color. 1A1=97° 51’. H.=5:5-6. G.=3-8- 
3°95. From Dauphiny, the Tyrol, and Brazil ; at Smithfield, R. I. 
Brookite is met with in thin hair-brown flat trimetric crystals, at- 
tached by one edge. Also in thick iron-black crystals, as in the va- 
riety called Arkansite. H.=5°5-6. From Dauphiny ; Snowdon in 
Wales ; Ellenvilie, Ulster County, N. Y. ; Paris, Maine ; gold wash- 
ings of North Carolina ; Magnet Cove, Arkansas (Arkansite). 
Perofskite. In cubic. crystals, of yellow, brown, and black colors ; 
chemical formula (Ti, Ca), O,. From the Urals, the Tyrol, and Maenet 
Cove, Arkansas. 
Besides the ores here ieeerined. titanium is an essential constituent 
also of tlmenite (titanic iron), and of the silicates titanite or sphene 
(p. 290), ketlhawite (p. 291), warwickite ; and occurs also in the zir- 
conia and yttria ores ewschynite, erstedite, and polymignite, and in some 
other rare species ; sometimes in pyr ochlore. 
COBALT. NICKEL. 
Cobalt has not been found native. The ores of cobalt 
are sulphides, arsenides, arseno-sulphides, an oxide, a car- 
bonate, a phosphate, and an arsenate; and nickel is often 
