No. 50.] 
105 
Hydrate of magnesia and carbonate of magnesia, compact and crys- 
talline. Found, according to Mr. Mather, at New-Rochelle. 
Quartz, drusy, calcedony, agate and jasper— New-Rochelle. 
Serpentine, almost every variety— New-Rochelle. 
Pyroxene — every where in the dolomite. 
Hornblende — Near Verplanck and elsewhere. Actynolite, tremohte 
and asbestus are also common. 
Hydrous anthophyllite — White-Plains ? Mather. 
Feldspar — Several localities, especially near Tarry town. 
Stilbite — West-Farms. 
Garnet — On the Croton river. 
Epidote — Peekskill. 
Chlorite — Rye. 
Tourmaline, in long slender crystals — Rye. 
Vauquelinite — Near Sing-Sing. Dr. Torrey. 
Magnetic pyrites — Sparta and Sing-Sing. 
Chromate of iron — New-Rochelle. 
Magnetic oxide of iron — In serpentine beds, with the preceding. 
Red ochre and red chalk — Cortlandtown. 
Sphene — Said to have been found near Peekskill, in an aggregate of 
quartz. 
YATES COUNTY. 
I have no information concerning the mineral productions of this 
county. A gas spring is credited to it ; and it deserves to be mention- 
ed that a mass of native iron was some years since found on the sur- 
face of the earth, in the town of Penn-Yan. It was probably of me- 
teoric origin, although, according to the analysis of Mr. Clemson, it 
contained no nickel. 
Such is a condensed account of the mineralogy of the several coun- 
ties in the State, and a summary of the materials which have been col- 
lected for illustrating this department of the survey. Although there 
can be no doubt that many discoveries will hereafter be made, we have 
already evidence enough to satisfy us that, much as New- York may 
[Assembly, No. 50.] 14 
