90 POTSTONE. 
is also too hard to suffer the same inconveniences of 
being scratched or broken as marble ; and its colours 
are stated to be indestructible. And such is the size of 
many of the blocks of serpentine, that columns of almost 
any dimensions may be wrought out of them. 
Of the serpentine obtained from the Island of An- 
glesea, and lately known by the name ofMona marble, a 
great proportion was sent to London by Messrs. Bullock 
and Co. who, until the death of Mr. Bullock, had a large 
warehouse and polishing rooms for it in Oxford-street. 
The prevailing colours of this stone are red and 
green. The quarries were worked by them to con- 
siderable extent. They manufactured it into chimney 
pieces, slabs, columns, and other articles ; and its great 
beauty, and its excellence, in many respects, over the 
generality of marbles, will recommend it strongly to the 
public notice. 
The chief places in which serpentine has hitherto 
been found are near Bareuth, and Zoblitz, in Saxony ; 
in some districts of Cornwall ; about six miles west of 
the Paris copper mine, in the island of Anglesea ; at 
Portsoy, in Bamffshire, and other parts of Scotland ; 
and at Cloghan Lee, in the county of Donegal, Ire- 
land. 
At Zoblitz there are some extensive manufactories., 
in which serpentine is made into vessels and ornaments 
of various shapes, that are carried for sale over nearly 
all parts of Germany. Several hundred persons are 
there employed in the working of this stone. 
The name of serpentine is derived from some of the 
varieties appearing coloured and spotted like a serpent's 
skin. This stone, when found intermixed with primitive 
limestone, or crystalline white marble, differs in no re- 
spect from the celebrated verde antique marble (149). 
133. POTSTONE, or LAPIS OLLARIS, is a greenish 
grey stone, unctuous to the touchy and so soft when Jirst taken 
from the quarry as to yield to the pressure of the nail, yet n&t 
easily broken. 
It is found in a massive state. 
