BY W. F. PETTERD, C.M.Z.S. 33 



Beaconsfield ; Mt. Heemskirk, foliated and partly altered 

 bo hydroraagnesite (Ballarat School of Mines Museum). 

 As crystalline bunches at Trial Harbour, West Coast. 



61. Calamine (Carhonate of Zinc). 



Although a rare mineral as occurring on the large scale, 

 small quantities have been found at several of the Zeehan 

 and Heazlewood silver lead mines. 



62. Campylite (ChJoroarsenate of Lead ). 



Small patches of the characteristic barrel-shaped 

 crystals of this variety of mimetite have occurred at the 

 old Britannia Mine, Zeehan, and near Williamsford, Mt. 

 Read. 



63. Carminite (Arsenate of Lead and Iron). 



An extremely rare mineral, which occurs in minute 

 orthorhombic groups of crystals that usually gather 

 together in the fractures, and lining the vughs in gossan. 

 The crystals are of a distinct reddish colour with a strong 

 adamantine lustre. It occurSj in limited quantity, at the 

 Magnet Mine. 



64. Calcite (Carhonate of Calcium). 



This well-known mineral crystallises in the rhombo- 

 hedral system. The varieties of crystalline form assumed 

 by calcite exceed those of all other minerals, and have 

 been carefully studied by mineralogists; so much so, that 

 above two hundred forms have been recorded. With the 

 exception of quartz, it is the most profuse of all minerals, 

 occurring in the form of marble and limestone in enormous 

 quantities. The beautiful Old World crystallisations of 

 this mineral, such as occur in Derbyshire and the North 

 of England, are unknown in this island, although in the 

 massive form it occurs abundantly, the notable localities 

 being Bridgewater, Maria Island, Gordon River, Beacons- 

 field, Don River, Mackintosh River, and other places. 

 As travertine, containing numerous fossil land-shells, it 

 occurs at Geilston on the east bank of the Derwent; as 

 Iceland spar, it is plentiful near St. Marys ; as stalactites 

 it is in profusion at the caves of Chudleigh, near Frank- 

 ford, and at the Upper Forth River; as small blue- 

 coloured crystals, at the Madame Melba Mine, North 

 Dundas ; and some remarkably fine crystals have been 

 obtained at the limestone flux quarry of the Mt. Lyell 



