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[Assembly 
variously coloured, and susceptible of polish. It is also found in St. 
Lawrence, Herkimer, Greene and Schoharie counties. In the latter, it 
occurs in various forms, and is associated with strontianite and other in- 
teresting minerals. The localities in this county I have not yet had an 
opportunity of visiting. 
Sulohate of baryta is of considerable value as a paint. Ordinary 
white ead often contains a large proportion of this mineral. When it 
is of a white colour, which is often the case, it is difficult to detect this 
adulteration, in consequence of the specific gravity of the sulphate of 
baryta approaching so nearly to that of the white lead. The mixture 
answers equally well as a paint for most purposes, but it should be sold 
at a much cheaper rate than the unadulterated article. Both the sul- 
phate of baryta of the northern part of the State and the carbonate of 
strontia of Schoharie, may become valuable as paints. 
21. Carhonaie of lime. — This important mineral is most abundantly 
diffused, and exists in vast strata under the name of limestone. There 
are several subspecies or varieties which are to be studied and described 
by the mineralogist. Among these may be enumerated: — Calcareous 
spar^ of which this State affords some fine localities, as De Long's mill, 
in St. Lawrence county, and Ox Bow, in Jefferson, where specimens 
have been found quite equal to the celebrated Iceland spar;— 3/7 5row5 
limestone^ agaric mineral^ and calcareous tufa; of each of which we 
have several interesting localities. The most useful and important of 
these are what are usually comprized under the general name of 
Marbles, 
22. The term marble, in strict propriety, should be confined to those 
varieties of carbonate of lime which are susceptible of a polish; including 
also some minerals in which the carbonate of lime is mixed or combined 
w^ith other substances. In a wider sense, however, it may include all 
those varieties of limestone which are used for building purposes. 
It is not my design at present to notice all the localities of marble in 
this State. The information which has been collected is not sufficiently 
ample to w^arrant such an undertaking. Enough, how^ever, is already 
known to satisfy us that New- York possesses inexhaustible stores of 
marble, which must form an important item in her mineral resources. 
23. The marbles of Sing-Sing and Kingsbridge in Westchester coun- 
ty, have long been used as building materials. Professor Mather will 
undoubtedly present full details concerning the extent and position of 
