PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 177 
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Vol. VI, No. 12. Washington, D.C. Oct. 5, 1883. 
Owing to their fine, homogeneous texture these rocks are great favor- 
ites for monuments and ornamental work, for which they are extensively 
used. Their somber colors, however, render them rather undesirable 
for geperal building purposes. 
SLATE. 
Slates of very good quality are extensively quarried at Munson and 
Brownville, Piscataquis County. So far asobserved they are blue-black 
in color, of fine, even texture, tough, and split readily into thin plates 
suitable for roofing purposes, for which they are principally used. They 
are also well adapted for mantels and fire-places, and at one time quite 
a business was carried on in the manufacture of these from the so-called 
“‘marbleized slate,” but which has since been discontinued. 
APRIL 5, 1883. 
Proc. Nat. Mus. 883——12 
