206 THE MINERALS OF NEW SOUTH WALES. 



Large tabular crystals of mica are met with in the coarse- 

 grained granite of the Bathurst District, as at Broadwater and other 

 places on the Macquarie River, and at Cooma and Wheeo j crystals 

 of a golden-coloured mica are also obtained from the same place, 

 and at Orange with crystals of felspar in a pink-coloured granite. 



Green mica is common in the granite of New England ; the mica 

 entering into the composition of the greisen at Elsmore, and New- 

 stead, and other places is green. Green mica also occurs in the 

 granite of Yarramgun and Ororal. 



In the Naas Yalley mica is found in large crystals, associated 

 with quartz, felspar, hornblende, tourmaline, and chlorite. 



A mammillated bright golden-coloured mica is found in white 

 quartz at Kiandra ; this has very much the appearance of rolled 

 gold, for which in fact it has been mistaken ; yellow mica also 

 occurs in Frazer's Creek. 



A bright-coloured mica with silvery lustre is met with in a 

 manganiferous cement at Buckley's Lead, Two-mile Flat. 



Large groups of beautiful plumose crystals of mica occur at Oura 

 Station, Wagga Wagga. 



Felspars. 



Orthoclase. — Common Felspar. 



Chemical composition : Aluminium and potassium silicate. 

 Oblique system. There are several varieties of this mineral: 

 Common Felspar includes all the common non-transparent varieties ; 

 adularia, the sub-transparent forms ; opalescent adularia is termed 

 moonstone ; and glassy felspar ; or ice spar comprises the clear and 

 transparent forms. 



Fine well-formed crystals of felspar are almost unknown here, 

 although fairly large and moderately well-developed crystals are 

 not uncommon in the coarse ground granites of the New England, 

 Bathurst, and Southern districts. Simple and compound crystals 

 of an inch or so in length, exposed by weathering, are common in 

 the granite of New England. Dark grey felspar at Mount Walker. 

 Medium sized crystals of glassy felspar are reported at Benada 

 Creek, also near Naas, and with quartz at Lanyon to the west of 

 Mount Tennant. Again near " The Pass" Bundian. With mica 

 chlorite and quartz at Windindingerrie Cataract. Acicular crystals 

 of glassy felspar occur in compact felspar at Mount Wingen 

 near the burning part. 



Crystallized adularia felspar is plentiful on Mount Lindesay. 



Albite. 



Chem. Comp. : Aluminium, sodium, and potassium silicates 

 Doubly oblique system. 



