102 
I Assembly 
X. AIJGITE ROCK. 
This rock occurs in a great number of localities in Putnam county, 
and in a few in Westchester county. 
It is sometimes intermixed with feldspar, but more commonly it is 
either by itself, or mixed with the various minerals that are usually 
associated with it. It occurs at most of the celebrated mineral localities in 
the Highlands. It is of all shades of colour, from white through gray and 
green of various shades to black, and from compact through various grades 
of granular to broad foliated masses, in the forms of fassaite, coccolite, 
common augite, sahlite, crystallized augite and diopside. The locali- 
ties of this rock, and descriptions of the minerals associated with it, 
will be contained in the final report of the survey. 
This rock has not been applied to any useful purpose. 
XI. GREENSTONE. 
Greenstone occurs in many places in Putnam, Westchester and New- 
York counties, forming dykes, which traverse the other rocks like veins, 
or it is interstratitied with them. Like the augite rock, it will be dis- 
cussed in the final report. 
It has not been applied to any use in the counties under examination. 
SILVER, LEAD, TIN, COPPER AND TITANIUM. 
Several mines have been opened in Putnam and Westchester counties, 
under the expectation of obtaining silver. I have examined a great 
number of ancient diggings in Putnam, Orange and Westchester coun- 
ties, where it is reported or imagined that silver has been, or is to be 
found; but I have seen no indications worth pursuing, or any ore that 
contained silver, unless in the copper and silver mines at Sing-Sing. 
These ores have not been analyzed, and it is not known that they even 
contain any silver, except from the common reports of the country that 
silver has been obtained fDom them. 
Almost all of the diggings are in or contiguous to limestone. Many 
interesting mineral localities have been opened, and an abundance of 
crystallized minerals dug out, and prepared for the hand of the collector 
of these beautiful productions of nature. 
It is, perhaps, superfluous to go into a detail of the numerous mining 
explorations in search of the precious metals in the Highlands; suffice 
it to say, that superstition and the mineral rod have been freely em- 
ployed, and credulous persons have permitted themselves to he imposed 
