roprEs okes. 299 j 



solution and effervescence in nitric acid. .The color also j 

 is not the bluish-green of chrysocolla. 



Obs. Green malachite usually accompanies other ores 

 of copper, and forms incrustations, which when thick, have 

 the colors .banded and extremely delicate in their shades and 

 blending. & Perfect crystals are quite rare. The mines of 

 Siberia, at Nischne Tagilsk, have afforded great quantities 

 of this ore A mass partly disclosed, measured at top 9 

 eet by 18 ; and the portion uncovered contained at least 

 half a million pounds of pure malachite. Other noted for- 

 eign localities are Chessy in France, Sandlodge in Shetland, 

 Schwartz in the Tyrol, Cornwall, and the island of Cuba. 



The copper mine of Cheshire, Conn., has afforded hand- 

 some specimens ; also Morgantown, Perkiomen and Phenix- 

 ville, Penn. ; Schuyler's mine, and the New Brunswick 

 copper mine, N. J. : it occurs also in Maryland, between 

 Newmarket and Taneytown, and in the Catoctin mountains ; 

 in the Blue Ridge, Penn., near Nicholson's Gap, and it is 

 found more or less sparingly with all kinds of copper ores. 



At Mineral Point, Wisconsin, a bluish silico-carbonate 

 of copper occurs, which is for the most part chrysocolla, or 

 a mixture of this mineral with the carbonate. An analysis 

 of the rough ore afforded Mr. D. D. Owen, copper 35*7, 

 carbonic acid 10*0, water 10*0, iron 15*7, oxygen 7, sulphur 

 8, silex 13-0. Specific gravity 3*69— 3*87. The vein ap- 

 pears also to the northwest on Blue River, and southeast on 

 the Peccatonica. This ore is abundant ; it has been smelted 

 on the spot and also exported to England. 



Uses. This mineral receives' a high polish and is used 

 for inlaid work, and also ear-rings, snuff boxes, and various 

 ornamental articles. It is not much prized in jewelry. 

 Very large masses are occasionally obtained in Russia, 

 which are worked into slabs for tables, mantel-pieces and 

 vases, which are of exquisite beauty, owing to the delicate '' 

 shadings of the radiations and zones of color, f At Versailles, l - 

 there is a room furnished with tables, vases,, and other arti- 

 cles of this kind, and similar rooms are to be found in many 

 European palaces. At Nischne Tagilsk, a block of mala 

 chite was obtained weighing 40 tons. 



Malachite is sometimes passed off in jewelry as turquois, J 

 hough easily distinguished by its shade of color and much I 



How does green malachite occur 1 What are its usee. 1 



