BY "\V. F. PETTERD, C.M.Z-S. l37 



tals of phosgenite are sometimes attached. Many remark- 

 ably fine specimens have been obtained at the Comet Mine, 

 Dundas; the Adelaide Mine has also afforded a limited 

 number; and at the Magnet some beautiful sharply-cui 

 crystals have been from time to time found, although 

 usually at this locality they are small in size. It is con- 

 sidered by mineralogists to be of somewhat rare occurrence 

 in nature. It has also been named cromfordite, from its 

 original locality, Cromford, Derbyshire, England. The 

 mineralogist Breithaupt's name, phosgenite, has priority 

 over that of cromfordite, given to the substance by Greg 

 and Lettsom. 



244. PicoTiTE (Aluminate of Magnesium and Chrome). 



This is also known as chrome spinel. It occurs in small 

 but perfectly formed octahedral crystals of an intense 

 black colour and high lustre. 



It is extremely plentiful at certain places in the allu- 

 vial on the banks of the Heazlewood River, not uncom- 

 monly in association with particles of gold and scales of 

 osmiridium. In the websterite dyke occurring at the 

 Magnet, which is partially weathered, this mineral occurs 

 sparsely scattered throughout the mass, which, on its 

 decomposition, imparts a green cNlouration to the rock, as 

 it becomes dolomitized. 



•245. PiCROLiTE (Fibrous Serpentine). 



A pale-green, somewhat radiating, variety of serpentine 

 fairly agrees with the above. It is often translucent, and 

 occasionally almost asbestiform. It occurs with bastite and 

 chrysotile at North-East Dundas; with magnetite and 

 pyrite of the Rio Tinto, Savage River. With the former 

 it is often closely associated. 



246. PiLOTiTE (Hydrated Silicate of Aluminium and 

 Manganese). 

 An altered variety of actinolite which has been termed 

 '' rock cork." It occurs in felted fibrous masses, of a pale- 

 grey to almost white colour, in considerable quantity at a 

 spot east of the " Red Face " at t'he Mt. Bischoff Tin Mine. 



247. PiMELiTE (Hydrated Silicate of Aluminium, Xickel, 

 and Magnesiuwj. 

 This doubtfully homogeneous substance is always of an 

 apple-green colour. It is of rare occurrence as small nodu- 



