206 Notices of the Geology, and Mineralogy of Sicily. 
tains, and in the chalk and clay strata, often forming entire 
bees the dark Jellon, most este emed for Ean ints. 
earliest periods. Petrified or agatized wood is found in 
Sicily ; also large agates with concentric layers which 
have been mekeg for the same. 
Jasper is very abundant, often in enormous stratiform 
masses ; also in rolled pebbles in the plains and valleys. 
Sometimes it is divided by fissures perpendicular to the 
strata into aid ed cubes. The Sicilian Emeralds are only 
Zeolite in the cavities of 
s dy in i hard piles ae ith stone 
ae tir 
abundant as to form a la 
give ith a brilliant glassy fracture. 
lining the sobs solitary or grouped, io a line to an 
inchin diameter. Sometimes in the fissures of the marl 
covering the ne 
Aluminous Sd Pusitenis schists are ebugdan ts in the trans- 
ition mountains of Nicorea, Fiume di Nisi, 
Bituminous Schists are found in scandens of ‘Taormina — 
c. Some are so highly impregnated as to be used for 
ws Took sometimes ea! are traversed by veins of quartz. 
abounds i in the chalk strata, and among 
. the Witaminais - schists. Fullers Earth is found in many 
_ places, particularly at Cantorbi. In some parts they 
for the same p purposes a mixture of chalk and clay. 
Porcelain Clay in large veins and in beds of white de- 
composed feldspar, in the mountains of Pelorus—also in large 
masses in excavations near Patania—Pie mer ) 
in wl richihowere found, and the rocks oe which they are 
ones _ calcareous or volcanic. On the sea 
