HYDROUS SILICATES—ZEOLITE SECTION. 301 
Silica 52°20, alumina 18°27, lime 6°58, soda and potash 2°12, 
water 20° 32. B. B. intumesces and fuses to a nearly opaque 
bead. Decomposed by hydrochloric acid, with the separa- 
tion of slimy silica. In the closed tube gives water. Phac- 
olite is a variety in complex glassy crystals. 
Diff. The nearly cubical “form often presented by the 
crystals of chabazite’ is a striking character. It is distin- 
guished from analcite as stated ‘under that species ; from 
calcite by its hardness and action with acids ; from fluorite 
by its form and cleavage, and its showing no phosphores- 
cence. 
Obs. Found in trap and occasionally in gneiss, syenyte, 
and other rocks. Chabazite is met with in the trap of Gon- 
necticut Valley, but in poor specimens; also at Hadlyme 
and Stonington, Conn.; Charlestown, Mass. : Bergen Hill, 
INES: Piermont, N. Y.; Jones’s Falls, near Baltimore 
(Haydenite). Nova Scotia affords common chabazite, and 
also the acadialite in abundance. ‘The Faroe Islands, Ice- 
Jand, and Giant’s Causeway, are some of the foreign locaii- 
ties; also the County of Antrim, Ireland. 
Herschelite. Near chabazite, if not identical with it. From Sicily. 
_ Gmelinite. Closely resembles some chabazite, but its crystals are 
usually hexagonal rather than rhombohedral in appearance. Formula 
(Naz,Ca)Ale O,. Sis. A Bergen Hill specimen afforded Silica 48 67, ala- 
mina 18°72, lime 2°60, soda 9°14, water 21°35=190°48. Gelatinizes with 
hydrochloric acid, but in other respects resembles chabazite. Occurs 
at Andreasberg ; in Antrim, Ireland ; in Skye; at Bergen Hill, N. J. ; 
in Nova Scotia at Cape Blomidon. Named after the chemist, Gmelin. 
Levynite (Levyne). Rhombohedral, and somewhat resembling gme- 
linite in its crystals ; excluding the water, having the quantivalent 
ratio of labradorite, 1:3:6. Colorless, white, grayish, reddish. From 
Iceland, Greenland, Antrim, Londonderry, Hartficld Moss near Glas- 
gow. Named after the erystallographer, Lévy. 
Harmotome. 
Monoclinic. Unknown except in compound crystals; and 
commonly in forms similar"to the annexed figure ; also in 
compound rhombic prisms. 
Color white ; sometimes gray, yellow, red, or brownish. 
Subtransparent to translucent. Lustre vitreous. H.—4°5. 
San" 45, 
Composition. BaAl O,,Si;+5 aq=Silica 46:5, alumina 15:9, 
baryta 23°7, water 13-°9=100; but a little of the baryta re- 
placed by potash. ‘BB. whitens, crumbles, and fuses quictly 
