HYDROUS SILICATES— MARGAROPHTLLITE SECTION. 309 



In the United States it occurs at Phillipstown, Port Henry, 

 Gouverneur, Warwick, N. Y. ; Newburyport, Westfield, 

 and Blandford, Mass.; at Kellyvale and New Fane, Vt.; 

 Deer Isle, Maine ; New Haven, Conn. ; Bare Hills, Md. ; 

 Hoboken, N. J. ; at Brewster's, Putnam County, N. Y., 

 where it occurs pseudomorphous after chondrodite, chlo- 

 rite, enstatite, biotite, etc. ; in Canada at Orford, Ham, Bol- 

 ton, etc. 



Serpentine forms a handsome marble when polished, es- 

 pecially when mixed with limestone, constituting verd- 

 ant i que marble. Its colors are often beautifully clouded, 

 and it is much sought for as a material for tables, jambs 

 for fire-places, and ornamental in-door work. Exposed to 

 the weather, it wears uneven, and soon loses its polish. 

 Chromic iron is usually disseminated through it, and in 

 creases the variety of its colors. Near Milford and New 

 Haven, Conn., a handsome verd-antique marble occurs 

 which was formerly worked. A white limestone, dotted 

 and spotted with green serpentine at Port Henry, Essex 

 County, N. Y., is much esteemed for its beauty, and is now 

 extensively worked. The name serpentine alludes to the 

 varied green colors of such rocks. 



Bowenite from Smitlifield, R. I., lias the composition of serpentine, 

 but the hardness 5 5-6, and the aspect of nephrite, with G. =2"59-2*8. 



Bastite or Schiller Spar, is a foliated pyroxene or bronzite altered 

 nearly to serpentine. AntUlite is similar. 



Deweylite. 



Massive. Whitish, yellowish, brownish-yellow, greenish, 

 reddish, in color, with the aspect of gum arabic or a resin. 

 Very brittle. H. = 2-3 5. G.=l-9-2-2'5. 



In composition near serpentine but containing 20 per 

 cent, of water. From Middlefield, Mass. ; Bare Hills, 

 Maryland (Gymnite); Texas, Pa., and from the Fleims Val- 

 ley, Tyrol. 



Cerolite. Related to deweylite ; from Silesia. Liiribachitc from Lim. 

 bach, and Zoblitzite from Zoblitz, are similar. 



Hydrophite. Like deweylite, but containing iron in place of part 

 of the magnesium. From Taberg in Smaoland. JenMnsite is a 

 fibrous variety, occurring on magnetite, at O'Neil's mine in Orange 

 County, N. Y. 



Genthite or Nickel-gymnite. Similar to deweylite, but containing 

 much nickel and G. =2*4, analysis affording Silica 35*36, nickel pro. 

 toxide 30*64, iron protoxide 0'24, magnesia 14*60, lime 0*26, water 



