laa Scientific Intelligence. 
pentine marbles, which occur in the northern part of the State of Ver- 
mont, and described such as any furnish a marble identical with the 
celebrated: verd antique of Eur I have since been requested to insti- 
tute a mineralogical and dened comparison of the European and Ver- 
mont = 
sults to which I have arrived possess some scientific as well as 
practical iiteboatk, for they not only show a curious replacement of ¢ar~ 
nate of magnesia for car rbonate of lime, the magnesite being most 
abundant in the Vermont marble, while malin! is the predominant spar 
in the European variety. It has also been ascertained, by experiments 
made by me some years since, that the Vermont serpentine marble and 
that mixture called verd antique, are uncommonly durable, resisting not 
only nore ene but also the action of acids, and to a remark- 
ale extent that 
of the 
veins in the Vermont marble, and of the calcite of the European ve 
antique. 1 offer ike analyses of the serpentine of the verd antique, 
both of Europe and of Vermont, showing their identity of composition, 
and also an analysis I made many years since of the softer serpentine 0 
Lynnfield in this State. 
—— consists essentially of ——— silicate of magnesia and 
of the protoxyd of iron, with occasionally a little — of "cht 
mium—these oxyds dion - ae pe, to the serpentine. The pres- 
ence of water of compos serpentine materially affects its hard- 
ness, the softer varieties containing the largest proportion of water. In 
some varieties I found as much as 15 per cent, while the lowest was 7 
per cent. Both the verd antiga serpentine of Europe and of Roxbury, 
rmont, contain between 12 and 13 per cent of water.. That from 
e ee. 
It will be observed on oe of the analyses I have anes that 
in the Vermont serpentine the white spar veins are chiefly compose of 
magnesite, while there are also veins consisting of ee a car 
of lime = of carbonate of iron. The — proporti 
from a also 
