208 
DESCRIPTIVE MINERALOGY. 
It should be stated, that minute drusy crystals of heavy 
spar occur in the water limestone at Schoharie. The ac¬ 
companying figure 36, the binaire of Haiiy, is introduced on 
the authority of Prof. Shepard. This mineral is also found in 
rhombic tables of a dark bluish grey colour, forming the bed 
of cubic crystals of iron pyrites, about a mile west of the 
court-house. It, moreover, occurs in lamina? running through 
the septaria which abound in the creek near Boyd’s mill, in the town of Middleburgh. In 
these cases, it is usually of a bluish colour, and may easily be reduced by cleavage to the 
primary form. 
St. Lawrence County. There are various localities of heavy spar in this county. In the 
town of Hammond, the crested variety occurs of a snow-white colour, and containing crystals 
of iron pyrites. Large crystals are found in the town of He 
Kalb. In the town of Fowler, tabular crystals are associated 
with specular iron ore. At the Parish ore bed, it accompanies 
calcareous spar in small geodes in the specular iron, and is found 
in tabular crystals having the primary form, with the acute edges 
replaced by two new sides, the raccourcie of Haiiy. Fig 37. 
P on k 90° ; M on k 129° 13' 54". 
This mineral also occurs in flattened crystals, variously modified, on the bank of Laidlaw 
lake, in the town of Rossie, where it is associated with limpid quartz, calcareous spar, and 
rarely fluor spar. These minerals are in a vein in the primary rock. The heavy spar is in 
implanted crystals, of a white or reddish-white colour, and is translucent or opaque. These 
crystals are sometimes two inches or more in length. The following forms have been observed 
at this locality : 
Fig. 38. Fig. 39. 
Fig. 39. The same, with one of the faces d 
much enlarged. 
Fig. 37. 
Fig. 36. 
Fig. 38. The trapezienne of Haiiy. 
