THE MINERALS OF NEW SOUTH WALES. 205 



Found in the Murrumbidgee district, near Mount Tennant ; also 

 at Bundian, with glassy felspar and quartz below ; the Windin- 

 dingerie Cataract ; at Gedgedzerick ; between Jingery, Bobbera, and 

 Pambula ; at Bibinluke, and the " Gap" Lewis Ponds ; the Shoal- 

 haven River ; also to the east of Bungonia ; Gulgong; Bathurst ; and 

 in the bed of the Gwydir Biver, and the Ora Ora. 



Garnet. 



Chem. Comp. : There are several kinds of garnet and they vary 

 in composition, but the most common are silicates of alumina, 

 lime, iron, manganese, and other bases. 



Cubical system : The rhombic dodecahedron and the icositetra- 

 hedron being the most common. 



It is the alumina-lime or common garnet which is most generally 

 met with, especially in the granite ranges, as at Hartley ; it is 

 found also at Bingera, at Ponds Creek, and other places near 

 Inverell, at Uralla, in a talc schist at Bathurst, Washpool Creek, 

 near Solferino ; Trunkey Creek, Abercrombie Biver, Coombing 

 Creek Copper Mine, with hyacinth and gold on the Old Trigomon, 

 Moama Biver, 4 miles west of Jillamalong Hill ; at Hardwicke, 

 near Yass. 



A dark greenish-brown garnet occurs in large quantities, with 

 magnetic iron ore, at Wallerawang, well crystallized in rhombic 

 dodecahedra, which contains 21-05 per cent, of metallic iron. 



Tourmaline. — Schorl. 



Chem. comp. : Very complex, but mainly composed of silicate 

 of alumina, iron, lime, soda, &c, with usually some 3 or 4 per cent, 

 of boracic acid; other substances such as lithia are often present. 



Crystallizes in the hexagonal system, usually in the form of 

 prisms having a more or less triangular section, and strongly 

 striated parallel to the principal axis. Large prisms are met with 

 in the New England district, and also in the Murrumbidgee. 

 When the crystals are small and more or less aggregated together 

 into bundles, the mineral is termed schorl ; the form of it is com- 

 mon in the granite of New England in the tin district. 



Large crystals are found in the South with pegmatite between 

 Mowwat and Burramungee ; with tremolite at Jejedzeric in 

 granite. 



It is also commonly found associated with gold, diamonds, and 

 other gems in drifts and river deposits, more or less rolled ; 

 at times all trace of the original crystallized form is removed. 



Mica. 



Muscovite, or Potash Mica. 



Chem. comp. : Aluminium and potassium silicate. Oblique 

 system. 



