I 
THE SECOITDART CROUr. 
169 
grey copper r it is probably tbe metalloid diallage that has 
given the Cerro de Guanaljacoa the reputation of riches in 
gold and silver, which it has enjoyed for ages. In some 
places, petroleum flows* from rents in the serpentine. 
Springs of water are frequent ; they contain a little sul- 
phuretted hvdrogen, and deposit oxide of iron. The Baths 
of Bareto are agreeable, but of nearly the same tempe- 
rature as the atmosphere. The geologic constitution of 
this group of serpentine rocks, from its insulated position, 
its veins, its connection with syenite, and the fact of its 
rising up across shell-formations, merits particular attention. 
Telds] lar w itli a basis of souda (compact feldspar), forms, 
'rith diallage, the eiiphotide and serpentine ; w ith pyroxene, 
dolerite and basalt ; and with garnet, eclogyte. These five 
rocks, dispersed over the whole globe, charged with oxi- 
^iulated and titanious iron, are pi’obably of similar origin. 
It is easy to distinguish two formations in the euphotide ; 
One is destitute ot amphibole, even when it alternates with 
•tinphibolic i-ocks (Joria in Piedmont, Eegla in the island of 
tloba), rich in pure serpeiiliue, in metalloid diallage, and 
Sometimes in jasper (Tuscany, 8axony) ; the other, strongly 
oharged with amphibole, often passing to dioritet,_ has no 
jasper in layers, and sometimes contains rich veins of copper, 
(Silesia, Mussinet in Piedmont, the Pyrenees, Parapara in 
Venezuela, Copper Mountains of North Ameiica). It is 
fhe latter formation of cu])botide wiiich, by its mixture 
■"ith diorite, is itself linked with hyperthenite, in which 
real beds of serpentine are sometimes developed in Scotland 
* Does there exist in the Bay of the Ilavaimah, any other source of 
Petroleum than that of Guanabacoa, or must it be admitted that the 
“ '’etun liquido,'’ which in 1.508 was employed by Sebastian de Ocampo 
tar the caulking of ships, is dried tip ? Tliat spring, however, fixed the 
^Mention of Ocampo on the port of the Havannali, where lie gave it the 
>iaii,e of Puerto de Catenas. It is said that abundant springs of petroleum 
also found in the eastern part of the island (Manantialis de betun y 
cjiiipapote) between Holguin and Mayari, and on the coast of Santiago de 
^uba, 
+ On a serpentine that flows like a penomhre^ veins of greenstone 
(diorite), near Lake Clunie, in Perthshire. See MacCuUooh, in Edinb. 
“/Hirn. of Science, 1824, July, pp. 3—16. On a vein of serpentine, and 
alterations it produces on the banks of Carity, near West-IJallocb in 
'►rfarshire, tee Charles Lyeli, 1. c., vol. iii., p. 43. 
