HYDROUS SILICATES—MARGAROPHYLLITE 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, ete. 
Serpentine forms a handsome marble when polished, es- 
pecially when mixed with limestone, constituting verd- 
antique 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 
Hiaven, 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. ‘Che name serpentine alludes to the 
varied green colors of such rocks. 
Bowenite from Smithfield, R. I., has the composition of serpentine, 
but the hardness 5‘5-6, and the aspect of nephrite, with G. =2°5)-2°8. 
Bastite or Schiller Spar, is a foliated pyroxene or bronzite altered 
nearly to serpentine. Anftillite 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.=1°9-2°25. 
In composition near serpentine but containing 20 Le 
ecnt. of water. From Middlefield; Mass. ; Bare Hil ls, 
Maryland (Gymnite); ‘Texas, Pa., and from the Fleims Val- 
ley, ‘I'yrol. | 
Cerolite. elated to deweylite ; from Silesia. Limbachite from Lim- 
bach, and Zvblitzite from Z blitz, are similar, 
Ilydrophite. Like deweylite, but containing iron in place of part 
of the magnesium. From Taberg in Smaoland. Jenkinsite 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 affordine Silica 85°36, nickel pro- 
toxide 80°64, iron protoxide 0°24, magnesia 14°60, lime 0°26, water 
