150 DESCRIPTIONS OF MINERALS. 
G.—6-3-6°4. Also a variety 4-4:°9. Consists of lead, alumina, and 
water. From Huelgoet in Brittany, and at a lead mine in Beaujeu ; 
also from the Missouri mines, with black cobalt, and from Canton 
mine, Ga. 
Anglesite.—Lead Sulphate. 
Trimetric. In rhombic prisms 
and other forms. lateral cleavage. 
IAN T=108° 484’, Also massive ; la- 
mellar or granular. 
Color white or slightly gray or 
green. Lustre adamantine ; some- 
times a litte resinous or vitreous. 
Transparent to nearly opaque. Brit- 
tle H.=2-°75-3. G.=6:1-6-4. 
Composition. Pb O18, affording 
about 73 per cent. of oxide of lead. 

PHCENIXVILLE. B. B. fuses in the flame of a candle, 
and, on charcoal, yields lead with 
soda. 
Diff. Resembles aragonite and some other earthy species ; 
but this and the other ores of lead are at once distinguished 
‘by specific gravity, and also by their yielding lead in blow- 
pipe trials. Differs from the carbonate of lead in lustre 
and in not dissolving with effervescence in acid. 
Obs. Usually associated with galena, and results from its 
decomposition. Occurs in fine crystals at Leadhills and 
Wanlockhead, Great Britain, and also at other foreign lead 
mines. In the United States, it 1s found at the lead mines 
of Missouri and Wisconsin ; in splendid erystallizations at 
Phoenixville, Pa.; sparingly at the Walton gold mine, Louisa 
County, Va.; at Southampton, Mass.; in Arizona, and in 
Cerro Gordo, Cal. 
Caledonite is a lead-and-copper sulphate, of azure-blue color. It is 
remarkable for a very perfect cleavage in one direction. G.=6-4. 
From Leadhills and Roughten Gill, England; also from Mine la Motte, 
Missouri. 
Lead selenate. A sulphur-yellow mineral, occurring in small glob- 
ules, and aifording before the blowpipe on charcoal a garlic odor, and 
finally a globule of lead. It is named Kerstenite. 
Crocoite.—Crocoisite. Lead Chromate. 
Monoclinic. In oblique rhombic prisms, massive, of a 
bright red color and translucent. Streak orange-yellow. 
H.=2°5-3. G.=5-9-6:1. 
