91 



crystalline structure, are not uncommon in the copper-bearing- 

 country north of Port Augusta. The ordinary massive mala- 

 chite occurs at several localities — most notably at the Burra ; 

 and Burr mentions the following places (without, however, 

 indicating the form — whether massive or crystallized) : — Mount 

 Barker, Montacute Mine, Eapid Bay, Wakefield, near the 

 Horseshoe on the Onkaparinga. It formed the chief ore at 

 the Kapunda and Burra Mines. 



Tate states that it occurs in the quartz veins in the meta- 

 phoric rocks in the neighbourhood of the Peake, Central xA.us- 

 tralia. It occurs in perfectly round nodules about three- 

 quarters of an inch in diameter on and near the surface of the 

 country round about Beltana. 



It is worthy of note that true malachite does not occur in 

 the Torke Peninsula mining district. It has there been met 

 with only as atacamite altered more or less into green carbonate 

 of copper by contact with the calcareous rocks. 



Sub-species Mysorin. — I have found this mineral of a dark- 

 brown colour occurring with crystallized malachite in red opal 

 rock from the Tudanamutana Mine. 



DiOPTASE. 



This form of silicate of copper occurs at the Appialina Mine 

 (Selwyn) . 



Chrysocolla. 



Yery good specimens of this mineral, enamel-like in texture, 

 have been found at the Burra Burra Mine, associated with 

 Azurite and Malachite. I have met with characteristic speci- 

 mens from the "Wallaroo and Kurilla Mines, Yorke Penin- 

 sula ; and Ulrich reports it as occurring at the Nuccaleena, 

 Yudanamutana and Mount Lyndhurst Mines. 



Burr mentions its occurrence at the Mount Barker Mine. 



Atacamite. 



This mineral is known to occur in three distinct states of 

 hydration, the varieties so formed containing in round numbers 

 about 12, 17, and 20 per cent, of water. I incline to the 

 opinion that tu'o, if not all of these varieties occur in this 

 colony ; but up to the present time I have only had the oppor- 

 tunity of chemically examining one specimen belonging to the 

 first variety. This mineral is found in every copper mine on 

 Yorke Peninsula, and was at one time represented by most 

 magnificent specimens at the New Cornwall Mine. Perfect 

 crystals nine inches long were found there, and groups of 

 crystals varying from an inch to two or three inches could be 

 obtained in considerable quantity. 



The specimen employed for analysis was from the Wallaroo 



