BY W. F. PETTERD, C.M.Z.S. 113 



cesses. It also occurs at the Heazlewood in limited quan- 

 tity, of a pale-green colour. 



194. Marmolite (Foliated Serpentine). 



Serpentines vary to a considerable extent, both in 

 colour and structure. This is the distinctly foliated 

 variety. 



Bonanza Mine, Dundas (Montgomery). 



195. Massicot (Yellow Lead Oxide). 



Usually occurs as a powdery coating on the sulphide or 

 oxidised lead ores ; it is but rarely met with in a massive 

 condition. It is often closely intermixed with the oxides 

 of antimony and iron. 



Obtained in comparatively large quantity with galena, 

 cerussite, and anglesit^. Comet Mine, Dundas ; with f erro- 

 manganese, cerussite, and galenite, biit rarely associated 

 with crocoisit-e, Adelaide Proprietary; incrusting Jameson 

 ite and galenite, usually intermixed with antimonial ochre, 

 Madame Melba, North Dundas; in limited quantity at 

 several of the Heazlewood and Zeehan silver-lead mines. 



At Dundas this ore gives high assay returns in silver^ 

 which metal probably occurs as an intermixed chloride. 



196. Matlockite (Oxy chloride of L^ad). 



A mineral first discovered at the old mining locality of 

 Matlock, in Derbyshire, England, and hence the name 

 given to it. It crystallises in the tetragonal system, but 

 affects a tabular habit, due to the development of the basal . 

 pinacoid, and thus may be distinguished from its congener 

 phosgenite. which has a prismatic habit, although falling 

 into the same crystallographic system. It is often pearly on 

 planes of cleavage, and may be transparent to translucent. 

 It was found in tabular crystals of a greenish-grey colour, 

 apparently rare, associated with mixed sulphide and car- 

 bonate ores of lead at the Sylvester Mine, Zeehan ; in 

 small patches of a honey-yellow colour attached to galena 

 at the Montana Mine, Zeehan. At the Magnet Mine it 

 is not rare, occurring of the normal form in smallish pale- 

 yellow crystals attached to gossany ferro-manganese, in 

 association with minute crystals of crocoisite and purplish 

 chalcophanite. 



197. Melaconite (Black Oxide of Copper). 



This mineral is also known as tenorit^e. Rarely found 

 in quantity ; its common mode of occurrence is as a thin 



