THE MINERALS OF NEW SOUTH WALES. 195 



Quartz crystals are common near the junction of the Turon and 

 Macquarie Rivers ; at Bukulla, clear and brilliant crystals ; from the 

 Diamond Mountain, Cudgegong, Macquarie River, in anamygda- 

 loidal basalt, Deep Lead, Gulgong Rush ; at Carcoar, containing 

 lamellar magnetite, also with a pale blue quartz. Well-developed 

 and brilliant crystals from Bullamalite Creek, a tributary of the 

 Mulwaree, near Goulburn, at Gurragangamore and other places on 

 the Goulburn Plains ; the Lachlan River, Cooma, Kiandra, the 

 Murrumbidgee ; in the Naas Valley, with tourmaline and schorl ; 

 between Pambula and Eden, with molybdenite. 



Up to the present the number of substances which I have 

 observed enclosed within quartz crystals found in this Colony is 

 not great. 



EndomorpTis in Quartz Crystals. 



1. Actinolite — Morvembah, Morendee,on the Meroo, a tributary 

 of the Cudgegong. 



2. Asbestos — Uralla. 



3. Cassiterite or Tin-stone — Albion and Newstead Mines, New 

 England. 



4. Epidote — Towamba and Maneero. 



5. Argentiferous Galena — Near Summer's Hill, Bathurst. 



6. Gold — Boro Creek and other places. 



7. Graphite — Head of Abercrombie River. 



8. Orthoclose felspar — Two-Mile Flat, Mudgee. 



9. Molybdenite — Bullio Flat, near Goulburn. 



10. -Rutile. 



11. Schorl and tourmaline — Murrumbidgee. 



JPseudomorplis. 



That is, quartz possessing the external form of other minerals. 

 Quartz after calcite — Gulgong, Yass, and Bathurst; also, often 

 iron pyrites and mispickle. 



Amethyst. — A pale purple-coloured variety of quartz. It occurs 

 as geodes in the basalt at Kiama ; the crystals are usually small, 

 not being more than § of an inch through. Found also at Dubbo. 

 A quartz vein containing amethystine quartz occurs near the top of 

 Bullabalakit. 



Agate. — Agates consist of mixtures of crystalline quartz and 

 chalcedony, usually arranged in concentric layers and bands ; their 

 structure is caused by the peculiar mode of formation, viz., by the 

 infiltration of silica into the amygdaloidal cavities of igneous rocks. 



They are common in the basalt at Kiama, near Scone, Inverell, 

 and other places, and are very plentiful in the beds of many of the 

 rivers and old drifts of New South Wales, as in the Mackintyre, 

 parts of the Gwydir, the Hunter, the Cookaboo, where they are 

 derived from the basalt of the Western Range or Dewingbong 

 Mountain. 



