GEOLOGX. $ 



which take their rise in those mountains, and feed the Thoung* 

 )in, it is to be found in a highly decomposed state." 



©oQpo5|ooo5n kyouk-hnan-bat. 



GRANITE VEINS. 



In a sandstone hill near Mergui is a vein of granite, three 

 feet thick, as described by Captain Tremenheere, which is a 

 great repository of tin. Granite veins are seen in granite near 

 Tavoy point ; and there is a narrow vein of granite on the 

 summit of the mountain range, that bounds the valley of Ta- 

 voy river on its east side. At Amherst, granite veins are nu- 

 merous, mixed with greenstone dykes, 



SYENITE. 



Referring to the mountainous range in the north-east part of 

 Amherst Province, Dr. Heifer says, " In some parts occurs 

 syenite, and only in one place granite." I have seen no sye- 

 nite in the provinces, yet it may possibly exist in those moun- 

 tains, though not probable. Granite boulders with schorl, that 

 I collected at the base of those mountains, have been some- 

 times erroneously termed syenite. 



GREENSTONE. 



At Amherst point the rocks are principally greenstone, with 

 veins of granite and quartz. It has never been analyzed, but 

 its mineral contents are manifestly different from the common 

 greenstone of Europe and America. It has no indications of 

 felspar, but contains considerable silex. It probably con- 

 sists of Hornblende, and quartz. Mr. Crawford enumerates 

 all the other rocks at Amherst correctly, but does not men- 

 tion greenstone. He has quartz rock in his list, in which he 

 may have included the greenstone. 



GREENSTONE SLATE. 



Greenstone slate, or diorite slate, forms large dykes in all 

 the three belts of granite in the southern Provinces. Baron 

 des Granges, to whom I submitted specimens, said that the 

 greenstone slate in the granite range nearest the sea was 

 composed of " flint (silicum) and hornblende." The quan- 

 tity of hornblende must however be small, for it has the appear- 

 ance of a silicious rock. It is very hard, but has often a trap- 



