74 
ECONOMICAL MINERALOGY. 
TABLE 
Shoiving the composition of various marbles and limestones found in the State of New-York, 
with the proportion of pure lime and magnesia which they contain. 
I. 
II. 
hi. 
IV. 
V. 
VI. 
YU. 
VIII. 
'! Carbonate of lime,. 
60.50 
75.65 
44.65 
98.50 
99.30 
93.50 
53.24 
61.75 
Carbonate of magnesia, _ 
39.50 
20.70 
30.00 
45.89 
38.25 
Silica and alumina,. 
2.25 
24.00 
0.90 
0.40 
3.75 
0.87 
i Oxide of iron,... 
0.35 
1.00 
0.35 
0.20 
trace. 
Bituminous matter,. 
0.30 
Moisture and loss,. 
1.05 
2.75 
Proportion of pure lime in 100 parts of the ) 
mineral, ... ) 
34.14 
42.69 
25.19 
55.58 
56.03 
52.76 
30.04 
35.04 
Proportion of pure magnesia in 100 parts of ) 
the mineral, .) 
19.12 
10.03 
14.54 
22.23 
18.54 
No. I. 
II. 
hi. 
IV. 
V. 
VI. 
VII. 
VIII. 
Dover, Dutchess county. White or bluish white ; made up of small grains. Page 68. 
Lockport, Niagara county. Greyish, compact; containing organic remains. Page 69. 
Rochester, Monroe county. Calciferous slate of Eaton; gives out a bituminous odour when struck. Page 69. 
Chittenango falls, Madison county. Grey crinoidal limestone. Page 69. 
Split Rock quarry, Onondaga county. Grey, and similar to the preceding. Page 69. 
Minischegongo creek, Rockland county. Dove-coloured, compact; has a conchoidal fracture. Page 70. 
Sing-Sing, Westchester county. White with dark spots, granular, and somewhat friable. Page 72. 
Kane’s quarry, Westchester county. White or bluish white, coarse grained, more compact than the preceding. 
Page 72, 
Manufacture of Lime. 
The minerals which have just been treated of, are also of great value in consequence of 
their use in the preparation of lime. Of this important article, the amount annually consumed 
in this State must be enormous. This amount, moreover, must constantly increase, in con¬ 
sequence of the new uses to which it is applied ; as for example, in agriculture, the prepara¬ 
tion of chloride of lime, &c. 
The following remarks, from one of the Annual Reports of Dr. Charles T. Jackson on the 
Geology of the State of Maine, will serve to convey some idea of the value of this article : 
“Few perhaps realize the fact,” says he, “that there are no less than fourteen millions of 
dollars worth of limestone within twenty feet of the surface in Thomason; and that already, 
while but a trifling portion of the stone is exported, nearly half a million of dollars are annual¬ 
ly realized from the sales of lime; besides which, we have also to estimate the value of the 
carrying trade, the whole business being in the hands of the citizens of Maine.” “ The lime,” 
the same gentleman remarks, “ serves to supply nearly all the cities on the Atlantic coast with 
the lime used in their buildings, and for agriculture.”* 
Second, Report on the Geology of the State of Maine, 1838. 
