BY W. F. PETTERD, CM.Z.S. 143 



remarkable in this respect, that they carry anhedral grains 

 of cassitlerite sporadically distributed. Pyrite occurs in 

 the form of small but perfect octahedra m vughs m the 

 pvritic ore-body of the Montana No. 2 Mine at Zeehan. 

 The forms are simple and quite free from stri«. L. K. 

 Ward.) 



264. Pyeochlore (Columbate and Titanate of Calcium, 



Lanthanum, Cerium, d'C.j. 



This rare mineral, or a species allied thereto, lias been 



discovered on what was known as the Shekleton Mining 



Syndicate's property, whose seat of operations was near 



Table Cape. ^ , i •„ 



It occurs in a granular condition, of a brown colour, m 

 alluvial drift, with zircon in abundance, and mpre sparingly 

 sapphire, the main portion of the wash being a quartz 

 erit "The Australian Mining Standard of October, 

 1896, states that an analysis by Dr. W. H. Craze gave the 

 following result, viz. : — . • i. ^r 



-A mobate of uranium and chromium, a variety of 



pyrochlore : — ^ ^ 



^•^ Per cent. Per cent. 



Ur ... 5 to 0-5 



Ch ... 10-5 to 12-5 



Ti ... 12 to 13 



Ni ... 4-5 to 2-5 



Fe ... 2.5-5 to 27-7 



Al ... 7-3 to 6-2 



Ca ... 2-6 to 1-5 



Si ... 15 to 12 



l)i ... 7-5 to 0-5 



La ... 6-2 to 2-2 



Th ... 1"0 to traces 



Yt ... I'o to traces 

 Professor Rosenbusch, the eminent petrologist in a com^ 

 munication to Mr. W. H. Twelvetrees, =t^t«^^ ^hat tte mica 

 solvsbergite of the Port Cygnet complex contains a mineral 

 1° small quantity which may belong to the PyrocUore 

 group. It is strongly refractive, red, transparent, and 

 isotropic. 

 265 Pykomoephite (Chlorophosphatt of Lead). 



This is the most important member of an isomorphous 

 group of arsenates, arsenophosphites, and Phosphates of 

 lead, ^vhich crystallise in the hexagonal system T^he ongm 

 of all the species forming this group is m a" P'^°>,''Yode^ 

 to be sought in the mispickel or apatite m t^f Jf^ 

 matter of its vicinity, by affording the acid radicals to 



