454 Cross and Hillebrand—Minerals in the basalt of 
many beautifully crystallized zeolites, associated with calcite 
and acegont e. e mode of occurrence varies somewhat in dif- 
ferent parts of the mountain, and a few species seem to be 
locally astrintad: but most of those to be described can be 
found in abundance and well develo 
Ata point on the southern face of North Table bad aaa 
where the greatest number of species occur together, the 
cimens several years ago. uring the present investigations 
the locality was still further opened, and absolutely fresh and 
clear material obtained. Up to the present time, the following 
species have been definitely determined, viz: analcite e, apoph- 
yllite, aragonite, calcite, chabazite, mesolite, natrolite, stilbite 
and thomsonite. Several others are in process of investigation, 
some of the species mentioned. In the further description, the 
order to be followed is primarily that of deposition at the 
above locality, where frequently as many as six or seven spe- 
cies occur together. 
e only previous notice of this mountain is embodied in 
the cor of Arch. R. Marvine, in Annual Report of the U. S. 
Geological and Geographical Survey of the Territories for the 
year 1873, pp. 129-131, but the eee! given is exceed- 
ingly meager, and in part e entirely incorre 
he Survey is indebted to Professor A. eka of the School 
of Nene for calling special attention to Table Mountain 
1. Chabazite. 
This mineral seems to be the oldest of the zeolites, with the 
exception of certain peculiar stratified deposits in some of the 
cavities, the character of which has not been fully determined. 
It was however pam ed in some places by yellow calcite, as 
will be described late 
In most cases she several zeolites occur.together, —-€ 
are de 
anally as much as 1 te diameter. The pends be are 
he twins of interpene Na 
n some of the smaller cavities are sub-dividing walls of cha- 
bazite, or miniature columns composed of many small crystals. 
A second generation of sbishastee came after thomsonite and 
pera. but the otpetale are few and very minute. No optical 
chemical examination has as yet been made. 
