XV. — GEOLOGY AND MINERALOGY. 135 



Among the minerals which accompany gold at Sandhurst, 

 Victoria, crystals of carbonate of lime and carbonate of iron are 

 prominent. The latter, or Siderite, is represented by a remarkable 

 group of three saddle-shaped crystals, which may be considered as 

 a unique instance, and is described in Vol. X., part 4, of the 

 " Proceedings of the Linnean Society of New South Wales." 



As a special collection has been formed comprising gold speci- 

 mens, and as the specimens of this metal from other parts of tlie 

 world than Australia are not numerous, part of them will be 

 found in the special gold collection, and a few in the general 

 collection. Among those from various parts of the world are 

 gold specimens from England, Scotland, Ireland, Sweden, France, 

 Germany, Bohemia, Hungary, Russia, India, South Africa, North 

 and South America, including Brazil, Peru, &c. 



X.— COLLECTION OF PRECIOUS STONES. 



In the centre, where the gold is, the collection of Precious 

 Stones from different parts of the world and from Australia has 

 also been placed. 



This collection includes a few black Diamonds and Carbonado 

 used for boring rocks with the diamond drill. 



A Diamond in its matrix from South Africa forms the most 

 interesting piece in the collection, as nowhere else lias 

 diamond yet been found under similar circumstances. The 

 matrix, which fills some large pipe-shaped cavities, contains a great 

 number of minerals, such as olivine, garnet, diallage, ifec, wliich 

 enter ordinarily into the composition of the so-called hydrothermal 

 rocks, besides some debris of the adjacent formation. According 

 to the best authorities such deposits will continue to consider- 

 able depths. 



Diamonds, Sapphires, Blue Topaz, and Zircons from New South 

 Wales will be examined with interest by the gold and tin miner, 

 as they may be found in the dish along with those metals. 



