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GUIDE TO THE AUSTRALIAN MUSEUM. 



As examples of large crystals : — Barytes from Cumberland, and 

 Whitherite from Alston Moore, England ; Orthoclase and Wer- 

 nerite, both from Renfrew, Canada ; Garnet, three inches along 

 diagonal, from Salides, Colorado; Rhodonite, Willemite, and 

 Franklinite, from Franklin, New Jersey. 



Opposite the large blocks of Malachite, on the top shelf of the 

 upright case, is a specimen of Muscovite (Mica) from Mitchell 

 County, North Carolina showing, when closely examined, some 

 hexagonal figures of crystallization. 



The following remarkable minerals will be found in the general 

 collection placed according to their class : — Turquoise from New 

 Mexico ; Chlorite, a pseudomorph after Garnet from Ishpening, 

 Michigan ; Wulfenite from Nevada ; Descloizite and Vauadinite 

 from southern Arizona ; Malachite with Azurite, and a stalactite 

 of Malachite from Arizona ; Electrum (an alloy of gold and silver 

 containing 30 per cent, of the last metal), crystallized in the shape 

 of the plant called Liver-wort, from Hungary. 



In the Tellurium and Selenium classes the following may bo 

 mentioned : — Sylvanite, a Telluride of Gold and Silver, from 

 Hungary ; Tellurium from Colorado, placed close to the same 

 metal (Catalogue No. 2042) from Transylvania ; a Selenide of 

 Bismuth, Guanajuatite, from Mexico ; this is a rare mineral of a 

 bluish-grey colour with metallic lustre. 



Another interesting mineral of Bismuth, which differs from the 

 above in composition, on account of the presence of Tellurium 

 instead of Selenium, is Tetradymite, which will be found in the 

 Catalogue No. 1651 in the Bismuth class. This mineral is of a pale 

 steel-grey colour, resplendent with metallic lustre, is from Retz- 

 banya, Hungary, and is the more interesting on account of its 

 having also been discovered in New South Wales. It has been 

 recently analysed and identified by Mr. Mingaye of the Depart- 

 ment of Mines. 



Roscoelite is a mineral which deserves special mention. It is 

 composed of Silica, Vanadic acid. Alumina, Potash, &c., and 

 occurs in dark minute scales like Mica ; it is from Granite Creek, 

 near Coloma, El Dorado County, California, where it occurs 



