198 THE MINERALS OF NEW SOUTH WALES. 



Hornblende Group. 



Hornblende. — Amphibole. 



Chem. comp. : Silica, magnesia, lime, iron, manganese, &c. 

 Oblique system. Different varieties of hornblende vary extremely 

 in colour, form, and composition : — 



1. Tremolite. — A white or nearly white variety occurs, at 

 Cooma, in long slender crystals. 



2. Actinolite. — A dark-green fibrous actinolite occurs at Mowem- 

 bah in quartz. 



3. Sahlite. — Crystals of this form occur in a compact augite 

 paste on the Cowriga Rivulet. 



Large crystals of common hornblende occur at Uralla, Tenter- 

 field, and in New England district, and in other places. In quartz 

 with lamellar magnetite, at Merrendee, on the Meroo, a tributary 

 of the Cudgegong; and on the road from Jungemonia to Uran- 

 been ; also at Cooma. 



Asbestos. — Amianthus. 



Chem. comp. : Magnesium silicate. 



A fibrous variety of hornblende. 



Said to occur in veins at Bukulla, at Guyong, and Berrada 

 Creek, Wellington. In basalt at the Pennant Hills, near Sydney. 

 "With auriferous quarts in diorite at Gulgong ; also found at 

 Wentworth, Lucknow Gold Field, Icely; Lewis Ponds Creek, 

 Lachlan River. 



Pectolite 1 



Chem. comp. : Aluminium calcium and magnesium silicate. 

 A light-grey and white fibrous mineral, very tough \ found at Mount 

 Walker by Mr. Wilkinson, containing casts of spirifers. The rock 

 has at the spot where this mineral occurs, been metamorphosed by 

 the intrusion of a vein of igneous rock. 



Chlorite. — Green earth. 



Chem. comp. : Hydrous silicate of alumnia and magnesia, with 

 more or less oxide of iron. 



In a confused mass of various crystallized substances, Gulgong, 

 Lachlan Piver. 



De Lessite. — A ferruginous chlorite. Its occurrence is mentioned 

 by the Pev. W. B. Clarke. 



Serpentine Group. 



There are several varieties of the mineral serpentine met with in 

 New South Wales. The rock of the same name is also found very 

 largely developed, both in the Northern, Western, and Southern 

 districts. 



