Case 70. 9541, Kempsey : contains 80 per cent, of binoxide of 



manganese. 



£964, Murrumbateman : cvystallized 2)i/?-oIusite. 



Rliodocrosite. Carbonate of manganese. Broken Hill : the rliodocrosite forms 

 globular masses coated with dolomite. 



Rhodonite. Silicate of manganese. A pretty pink mineral, capable of 



taking a good polish. 



5494, Block 10, Broken Hill ; crystals. Ehodonite occurs in 

 the sulphide ore at Broken Hill, and is sometimes mistaken for 

 garnet. 



5353, Bendemeer; polished. 



Also, from Tilbuster, Warne Eiver, Manilla, and Bundarra. 



CHROMIUM. 



Case 73. A considerable quantity of ores of chromium is used in the 



Arts, more particularly in the manufacture of chrome steel aud 

 , chemical salts, and for basic linings in furnaces. Chrome iron 



or cliromite is the only ore. 



Chromite. Chromate of iron : a black mineral, usually massive, that can 



be just scratched with a good knife. It invariably occurs in 

 irregular masses in serpentine. 



In New South Wales chromite has been found in many 

 serpentine areas. Bingera, Barraba, Gordonbrook, Lionsville, 

 Manilla, Tulgilbar, the Upper Manning, Young, and other 

 •districts from which payable chrome has not as yet been 

 obtained, are represented. 



5354, from near Manilla, and 1557, from Tulgilbar, show 

 slickensided surfaces. 



S097, Coolac, Mooney Mooney Eange, shows the junction of 

 the ore with serpentine. 



Chromite of good quality has been found near G undagai, and has 

 been mined more or less actively for some years. Several classes 

 of ores, assaying up to 55 per cent, of chromic oxide, are exhibited. 



