410 
DESCRIPTIVE MINERALOGY. 
Lewis County. The brown variety, both granular and massive, with galena and calcareous 
spar, is found in small quantities in veins in the Trenton limestone, near the village of Mar- 
tinsburgh. 
Monroe County. Zinc blende, of a wax-yellow colour, both massive and crystallized, in 
the form of the dodecahedron (Fig. 483), has been found in cavities in the limestone near 
Rochester. It is sometimes associated with galena, but the mineral is not abundant, and 
perfect crystals are exceedingly rare. 
Montgomery County. This mineral, in very minute light yellow translucent crystals, 
occurs, associated with galena, on Flat creek, two miles southeast of Spraker’s basin in the 
town of Root. Among the forms are the dodecahedron (Fig. 483), and the regular octahe- 
in m, or g' on m' 109° 
Fie. 484. 
Fig. 485. 
Fig. 
484. 
dron, 
28' 16". 
Niagara County. Crystals of zinc 
blende, having a fine honey and wax-yellow 
colour, are found in the limestone at Lock- 
port. They are translucent and transparent; 
have the form of the octahedron, the dode¬ 
cahedron (Fig. 483 and 484), and of that 
represented in Fig. 485 {Horton). 
Similar crystals are found on Goat island, near Niagara falls. They are in the form of the 
dodecahedron, but usually imperfect. They are sometimes flattened, and have some of the 
angles rounded. 
Oneida County. There are several localities of zinc blende in this county. Near Hamilton 
College, it has been found in yellow and nearly transparent crystals. The yellow massive 
variety is found near the villages of Rome and Vernon. 
Orange County. In the Highlands, zinc blende occurs black, opaque, nearly dull, and 
resembling some varieties of hornblende. It is not abundant. 
St. Lawrence Count\ t . Since the opening of the lead mines in this county, zinc blende 
has been found in various places, and in some instances in considerable quantity. At Cooper’s 
falls, it is met with in a vein of carbonate of lime. At Mineral point, the massive variety is in a 
vein accompanying galena, in a similar gangue. The blende at both these localities has a 
brown colour and foliated structure. A specimen from Mineral point had the following com 
position, viz : 
Sulphur,... 32.80 
Zinc. 59.40 
Iron,. 6.30 
Gangue and loss,. 1.50 
On the farm of Mr. Belmont in the town of Fowler, there is, according to Dr. Emmons, a 
vein made up in about equal proportions of zinc blende, iron and copper pyrites. It is about 
