192 Account of the Geology, Mineralogy, Scenery, &. 
times diverging from a point, but often radiating from a cen- 
tre ; with nitric acid it forms a jelly. Stilbite [I found asso- 
ciated with prehnite, in distinct well defined pic ce some- 
times in irregular groups, but often insulated.. The crysta- 
line form may be described either as a flat ioep-aiina rec- 
tangular prism, acuminated by four planes set on the lat- 
eral edges, or as an elongated, six-sided table, bevelled on 
jour of its lesser sides—the sides are proportioned as two is 
to five, the colour white with pearly lustre ; the structure is 
laminated ; itis translucent, ans than prehnite, and does not 
form a je elly with acids. Since my discovery of datholite 
at Patterson, I have sought in vain for this mineral else- 
where in the greenstone ranges ; the gene of the falls is 
the only locality for it yet found in this country—and there 
is but one in Europe ;—its character was conjectured by 
Col. Gibbs and ascertained by Dr. Torry by analysis. The 
Patterson datholite will probably be regarded as a new va- 
riety of the Norwegian mineral, differing in crystaline 
form and proportion of constituent parts. ‘The above men- 
tioned minerals are generally found Roneeeene with an 
amended that embraces considerable 
. Mural precipices of age fine grained fissile greenstone 
are observed at the little falls of the Passaic,ifive Sales from 
oe car ss seams cross each other at va- 
rious angles in the ledges 2 Biving to many detached pieces a 
regular prismatic form with t three and four sides, often trun- 
ted on one or more of the lateral edges ; a tabular form 
is common. Rock of similar character was often observed 
in other parts of the Pracknes ridge. Organic remains from 
the ocean, or petrifactions of orthoc cerites, madrepores, tu- 
bipores, pectinites, terebratulas, encrinites, bilabites, ser- 
pulites, and other species, generally in an argillaceous base, 
resting on mountain and valley, I have found in the vicin-' 
ity of Patterson, and in many parts of the secondary spose | 
of New-Jersey. 
The situation of Patterson is admirably adapted for a 
manufacturing town—it is within four miles of sloop navi- 
gation upon a never failing stream, that furnishes water pow- 
er sufficient for two hundred mills, and mill-seats without 
end; fuel is abundant and the market can be well supplied 
from the beautiful and fertile valley through which winds the 
Passaic. The streams auxiliary to this river embrace the 
