Census of Victorian Minerals. 271 



occurrence may be given, as in this instance, it must be 

 understood that, owing to the fact that the various 

 metallic meteorites found in the colony, viz. — The 

 Cranbourne Nos. 1 and 2, the Langwarrin and the 

 Beaconsfield, are undoubtedly fragments of a parent 

 body, their mineral constituents will be identical but 

 perhaps not equally distributed. The want of an 

 exhaustive examination is probably responsible for the 

 apparent absence of them in some of the meteorites (W.). 

 Talc. — Hydrous magnesium silicate. 



Consists of small scales stained with ferric oxide, occurs as 

 a vein six inches wide, Hedi (W.). The record of talc 

 from Heathcote is incorrect, the mineral proved to be 

 talcosite (XJ.). 

 Tennantite.§ — Sulpharsenite of copper. 



The specimen closely resembled tetrahedrite but gave strong 

 reactions for arsenic instead of antimony ; it is associated 

 witli chalcopyrite in a quartz gangue. Empress Lode, 

 Merry Creek (W.). 

 An assay of a bulk sample gave as follows (M.Dt.) : 

 Copper, 15 "8 per cent. 

 Gold, 13 dwts. 1 grain per ton. 

 Silver, 9 ounces 9 dwts. 1 1 grains per ton. 

 Tetradymite.§ — Bismuth telluride. 



Plates with splendent metallic lustre in places showing a 

 light bronze tarnish cleaves easily into laminae, strongly 

 resembles molybdenite; occurs associated with gold in 

 quartz, Maldon Gold Field Coy. The composition of 

 this mineral had been ascertained by Mr. Hiscock from 

 whom the specimen was received (W.). 

 Tourmaline. — A complex silicate containing boron. 



Concentric radiating groups in quartz, Lindenow; in binary 

 granite iiear Nar-nar-goon (W.). In greisen, Cassilis 

 (CI.). 

 Troilite. — Monosulphide of Iron. 



Occurs almost entirely as more or less rounded masses, 

 varying in size from half-an-inch to more than two 

 inches in length. They are usually surrounded by 

 schreibersite and graphite, and sometimes by daubree- 



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