BY W. F. PETTERD. 45 
Per cent. 
Aluminium Sulphate: sc.c2.cse.toscsenscne-coccsane 30°02 
INTe eRe URC n ccc ccecnsccceeaesnseccessesse5toess 11°60 
Magnesium Sulphate ..........ccssescsresnssseees 4°95 
[ipieaa (STU) Gopekbocnoak epdeck pe Taos oOre eee Tae 4°77 
Gorm PERCOUS LSULPRALe....c4cccocresccesccss enone 3°57 
Wt belaenmetctt: sc cccessaccsndenegeedanemscscdrenespeds's« 44°90 
99°81 
Bieri GUNIGKOl  secaisieiscscqhieeeses dsederenedestde ods 4°40 
MCEAUIG' ZINC sec04080 6 ons vie clegaiteag es vs Ss od dedss tee. 1°93 
The formation of the mineral is doubtless due to the oxidation 
of Sulphides of Nickel, Zinc, and Iron in contact with rocks 
capable of yielding Alumina and Magnesia, which would explain 
the evolution of heat stated to occur during its production.” 
135. MAGNESITE (Carbonate of Magnesia). 
Occurs in Serpentine, Parson’s Hood Mountain ; in veins, Trial 
Harbour; Meredith Range ; Dundas ; Heazlewood. 
136. MARCASITE (White Iron Pyrites). 
This species is dimorphous with ordinary Pyrite, but is paler in 
colour. Itis apparently of more modern origin, as it is of common 
occurrence in Lignite, Coal, and Clays. 
Often occurs in the Mersey and Don Coal Measures, near the 
Scamander River; Mount Heemskirk; Beaconsfield; St. Mary’s ; 
Waterhouse ; and in small quantity in many other localities. 
1387. MAGNETITE (Magnetic Iron Oxide). 
A remarkably pure highly magnetic form occurs in large 
quantity at the Hampshire Hills; it is somewhat granular in 
structure and presents a beautiful iridescent tarnish ; fairly abundant 
in the vicinity of the Pieman River; Emu River; Ilfracombe. 
Abundant on the banks of a small tributary of the Blyth River, 
near Housetop Mountain; Mount Pelion; Dundas; and other 
places. Magnetite powders black, which is very characteristic. 
It is supposed that Hornblende, upon decomposition, often alters 
to this mineral. 
138. 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 Anglesite, Mastrie’s Broken Hill and Comet mines, Dundas ; 
with Ferro-manganese, Cerussite and Galenite, but rarely associated 
with Crocoisite, Adelaide Proprietary ; incrusting Jamiesonite 
and Galenite, usually intermixed with Antimonial Ochre, Madam 
Melba, North Dundas; in limited quantity at several of the 
Heazlewood and Zeehan Silver-lead mines. 
