206 Notices of the Geology, and Mineralogy of Sicily. 
tains, and in the chalk and clay strata, often forming entire 
beds ; the dark yellow, most esteemed for gun flints. 
Agates are extremely abundant in most parts of Sicily 
and in very great variety. They have been known from the 
earliest periods. Petrified or agatized wood is found in 
Sicily ; ; also large agates with concentric layers which 
have been mistaken for the same. ~ 
Jasper 18 very abundant, often in enormous straniier 
masses ; also in rolled pebbles in the plains and valleys. 
Sometimes it is divided by fissures perpendicular to the 
strata into irregular cubes. ‘The Sicilian Emeralds are only 
quartz or jasper coloured green. Zeolite in the cavities of 
ancient lavas in groups of radiated fibres ; also ina brec- 
cia of sand and volcanic fragments and in the lavas of the 
rocks of the Cyclops. 
Analcimes (Cyclopite Ferr.) found in the rocks of the 
Cyclops, and also in the cavities among masses of those 
ancient lavas, now covered with limestone strata—general- 
~ ly ina hard homogeneous lava with minute pores, some- 
times so abundant as to form a large part of the mass and 
give it a brilliant glassy fracture. The crystais are found 
lining the cavities, solitary or grouped, from a line to an 
inchin diameter. Sometimes in the fissures of the marl 
covering the lavas. 
Aluminous and Pyritous sAReetea are abundant in the trans- | 
ition mountains of Nicorea, Fiume di Nisi, &c. 
Bilumunous Schists are found in mountnns of Taormina 
&c. Some are so highly impregnated as to be used for 
fuel, sometimes thgy are traversed by veins of quartz. 
Wine Ciay abounds in the chalk strata, and among 
the bituminous schists. Fullers Earth is found in many 
places, particularly at Cantorbi. In some parts they use 
tor the same 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 Catania—Pigments abound in 
the more recent formations of Sicily ; of every shade of 
colour. A very delicate green pigment is found at Castro- 
giovanni. —Sandstones and Breccias are very common in 
Sicily, and vary in compositions according to the distriets 
in which they are found, and the rocks from which they are 
formed, granitic, c calcareous or volcanic. On the sea 
