260 Geology and Mineralogy of Salisbury. 
Brown oxid of fron.—Va. *Brown hematite—at the 
ore bed in beautiful stalactites, coated with maganese. 
Compact brown oxtd of Iron—associated with the hema- 
tite at the ore bed. 
Ochrey brown oaid of Iron—Yellow ochre is in consid 
erable abundance at the same locality. 
Argillaceous oxid of Iron.—In Cleaveland’s mineralogy 
granular argillaceons oxid of iron is said to be found in 
this town——but it must be a mistake—no variety of this is 
found here but the common, which has a compact ee 
ture, color yellowish, fracture conchoidal. 
Sulphate of Iron—occurs on the summit of a high hill, 
(Barrue Monteith,) half a mile east of the meeting- “house. 
Discovered about 20 years since by Mr. Samuel Moore, 
surveyor. It is produced by the decomposition of iron 
pyrites which forms a vein of considerable thickness in 
mica-slate. It is sufficiently abundant to make it worth 
collection. 
Sulphuret of Lead. Galena.—Rare, in thin laminae, in 
limestone. A vein of it passes through Ancram 12 miles 
distant which is very rich. It is also met with in many 
places in Dutchess county, N. Y. 
- Zinc—In some form at the ore bed—probably the szl- 
ceous oxide—also in artificial masses of a striped pea in 
the furnace. i 
* The formation of the ore in this town is involved in some difficulties. 
While the position of the stalactites indicates the action of water, and their 
regularity of form the laws of crystallization, other masses have the ap- 
pearance of having been acted on by fire. They often resemble ore that 
has been melted and gently agitated when cooling. What tends to con- 
vince the observer of the action of fire is the frequent cccurrence of sharp 
and angular fragments projecting from smooth surfaces as if they had 
fallen there when the mass was ina fused state. There are, J think, insuper- 
able objections to the agency of fire in forming the stalactites. The fol- 
lowing is extracted from a letter from Prof. Dewey on this subject. 
“¢ There are great objections to Mr. Eaton’s notion of the formation of your 
stalactical ore. For if heat be the cause ashe supposes, you have ore 
crvstalized and adhering to a mass halfan inch thick only which shows no 
action of fire at all—and you eannot believe that the inside of a ball four 
mches in diameter has been melted and the adjacent parts incrusted on.” 
+Cadmia is not produced when the ore is previously roasted, being 
volatilized by the heat. For the chemical characters and analysis of the 
gadmia, see Torrey in No, 2. Vol. §. of this Journal. 
